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</button> <ul id="toc-Features-sublist" class="vector-toc-list"> <li id="toc-Architecture" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Architecture"> <div class="vector-toc-text"> 3.1 Architecture </div> </a> <ul id="toc-Architecture-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-System" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#System"> <div class="vector-toc-text"> 3.2 System </div> </a> <ul id="toc-System-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Included_programs" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Included_programs"> <div class="vector-toc-text"> 3.3 Included programs </div> </a> <ul id="toc-Included_programs-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-System_requirements" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#System_requirements"> <div class="vector-toc-text"> 4 System requirements </div> </a> <ul id="toc-System_requirements-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Reception" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Reception"> <div class="vector-toc-text"> 5 Reception </div> </a> <ul id="toc-Reception-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> 6 References </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> 7 External links </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> 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Available in 35 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-35" aria-hidden="true" > 35 languages </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%88%D9%8A%D9%86%D8%AF%D9%88%D8%B2_%D8%A5%D9%86_%D8%AA%D9%8A_3.1" title="ويندوز إن تي 3.1 – Arabic" lang="ar" hreflang="ar" data-title="ويندوز إن تي 3.1" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target">العربية</a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – Azerbaijani" lang="az" hreflang="az" data-title="Windows NT 3.1" data-language-autonym="Azərbaycanca" data-language-local-name="Azerbaijani" class="interlanguage-link-target">Azərbaycanca</a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – Catalan" lang="ca" hreflang="ca" data-title="Windows NT 3.1" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target">Català</a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – Czech" lang="cs" hreflang="cs" data-title="Windows NT 3.1" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target">Čeština</a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Microsoft_Windows_NT_3.1" title="Microsoft Windows NT 3.1 – Danish" lang="da" hreflang="da" data-title="Microsoft Windows NT 3.1" data-language-autonym="Dansk" data-language-local-name="Danish" class="interlanguage-link-target">Dansk</a></li><li class="interlanguage-link interwiki-de badge-Q17437796 badge-featuredarticle mw-list-item" title="featured article badge"><a href="https://de.wikipedia.org/wiki/Microsoft_Windows_NT_3.1" title="Microsoft Windows NT 3.1 – German" lang="de" hreflang="de" data-title="Microsoft Windows NT 3.1" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target">Deutsch</a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – Estonian" lang="et" hreflang="et" data-title="Windows NT 3.1" data-language-autonym="Eesti" data-language-local-name="Estonian" class="interlanguage-link-target">Eesti</a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – Greek" lang="el" hreflang="el" data-title="Windows NT 3.1" data-language-autonym="Ελληνικά" data-language-local-name="Greek" class="interlanguage-link-target">Ελληνικά</a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – Spanish" lang="es" hreflang="es" data-title="Windows NT 3.1" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target">Español</a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – French" lang="fr" hreflang="fr" data-title="Windows NT 3.1" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target">Français</a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%9C%88%EB%8F%84%EC%9A%B0_NT_3.1" title="윈도우 NT 3.1 – Korean" lang="ko" hreflang="ko" data-title="윈도우 NT 3.1" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target">한국어</a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%8E%D5%AB%D5%B6%D5%A4%D5%B8%D5%B8%D6%82%D5%A6_%D4%B7%D5%B6%D4%B9%D5%AB_3.1" title="Վինդոուզ ԷնԹի 3.1 – Armenian" lang="hy" hreflang="hy" data-title="Վինդոուզ ԷնԹի 3.1" data-language-autonym="Հայերեն" data-language-local-name="Armenian" class="interlanguage-link-target">Հայերեն</a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%B5%E0%A4%BF%E0%A4%82%E0%A4%A1%E0%A5%8B%E0%A4%9C%E0%A4%BC_%E0%A4%8F%E0%A4%A8.%E0%A4%9F%E0%A5%80._%E0%A5%A9.%E0%A5%A7" title="विंडोज़ एन.टी. ३.१ – Hindi" lang="hi" hreflang="hi" data-title="विंडोज़ एन.टी. ३.१" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target">हिन्दी</a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – Croatian" lang="hr" hreflang="hr" data-title="Windows NT 3.1" data-language-autonym="Hrvatski" data-language-local-name="Croatian" class="interlanguage-link-target">Hrvatski</a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – Indonesian" lang="id" hreflang="id" data-title="Windows NT 3.1" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target">Bahasa Indonesia</a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – Italian" lang="it" hreflang="it" data-title="Windows NT 3.1" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target">Italiano</a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – Hungarian" lang="hu" hreflang="hu" data-title="Windows NT 3.1" data-language-autonym="Magyar" data-language-local-name="Hungarian" class="interlanguage-link-target">Magyar</a></li><li class="interlanguage-link interwiki-mr mw-list-item"><a href="https://mr.wikipedia.org/wiki/%E0%A4%B5%E0%A4%BF%E0%A4%82%E0%A4%A1%E0%A5%8B%E0%A4%9C_%E0%A4%8F%E0%A4%A8%E0%A4%9F%E0%A5%80_%E0%A5%A9.%E0%A5%A7" title="विंडोज एनटी ३.१ – Marathi" lang="mr" hreflang="mr" data-title="विंडोज एनटी ३.१" data-language-autonym="मराठी" data-language-local-name="Marathi" class="interlanguage-link-target">मराठी</a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/Microsoft_Windows_NT_3.1" title="Microsoft Windows NT 3.1 – Japanese" lang="ja" hreflang="ja" data-title="Microsoft Windows NT 3.1" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target">日本語</a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Windows NT 3.1" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target">Norsk bokmål</a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – Polish" lang="pl" hreflang="pl" data-title="Windows NT 3.1" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target">Polski</a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – Romanian" lang="ro" hreflang="ro" data-title="Windows NT 3.1" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target">Română</a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – Russian" lang="ru" hreflang="ru" data-title="Windows NT 3.1" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target">Русский</a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – Simple English" lang="en-simple" hreflang="en-simple" data-title="Windows NT 3.1" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target">Simple English</a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – Slovak" lang="sk" hreflang="sk" data-title="Windows NT 3.1" data-language-autonym="Slovenčina" data-language-local-name="Slovak" class="interlanguage-link-target">Slovenčina</a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – Slovenian" lang="sl" hreflang="sl" data-title="Windows NT 3.1" data-language-autonym="Slovenščina" data-language-local-name="Slovenian" class="interlanguage-link-target">Slovenščina</a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – Serbian" lang="sr" hreflang="sr" data-title="Windows NT 3.1" data-language-autonym="Српски / srpski" data-language-local-name="Serbian" class="interlanguage-link-target">Српски / srpski</a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – Serbo-Croatian" lang="sh" hreflang="sh" data-title="Windows NT 3.1" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="Serbo-Croatian" class="interlanguage-link-target">Srpskohrvatski / српскохрватски</a></li><li class="interlanguage-link interwiki-tl badge-Q70893996 mw-list-item" title=""><a href="https://tl.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – Tagalog" lang="tl" hreflang="tl" data-title="Windows NT 3.1" data-language-autonym="Tagalog" data-language-local-name="Tagalog" class="interlanguage-link-target">Tagalog</a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%B5%E0%AE%BF%E0%AE%A9%E0%AF%8D%E0%AE%9F%E0%AF%8B%E0%AE%B8%E0%AF%8D_%E0%AE%8E%E0%AE%A9%E0%AF%8D%E0%AE%9F%E0%AE%BF_3.1" title="வின்டோஸ் என்டி 3.1 – Tamil" lang="ta" hreflang="ta" data-title="வின்டோஸ் என்டி 3.1" data-language-autonym="தமிழ்" data-language-local-name="Tamil" class="interlanguage-link-target">தமிழ்</a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%A7%E0%B8%B4%E0%B8%99%E0%B9%82%E0%B8%94%E0%B8%A7%E0%B8%AA%E0%B9%8C%E0%B9%80%E0%B8%AD%E0%B9%87%E0%B8%99%E0%B8%97%E0%B8%B5_3.1" title="วินโดวส์เอ็นที 3.1 – Thai" lang="th" hreflang="th" data-title="วินโดวส์เอ็นที 3.1" data-language-autonym="ไทย" data-language-local-name="Thai" class="interlanguage-link-target">ไทย</a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – Turkish" lang="tr" hreflang="tr" data-title="Windows NT 3.1" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target">Türkçe</a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/Windows_NT_3.1" title="Windows NT 3.1 – Ukrainian" lang="uk" hreflang="uk" data-title="Windows NT 3.1" data-language-autonym="Українська" data-language-local-name="Ukrainian" 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free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">First major release of Windows NT, released in 1993</div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">This article is about the major release of Windows NT. For the consumer operating system, see <a href="/wiki/Windows_3.1" title="Windows 3.1">Windows 3.1</a>.</div> <div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Operating system</div> <style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox vevent"><caption class="infobox-title summary">Windows NT 3.1</caption><tbody><tr><td colspan="2" class="infobox-subheader">Version of the <a href="/wiki/Windows_NT" title="Windows NT">Windows NT</a> operating system</td></tr><tr><td colspan="2" class="infobox-image"><a href="/wiki/File:Microsoft_Windows_NT_3.1_logo_with_wordmark.svg" class="mw-file-description"><img alt="Logo of Windows NT 3.1" src="//upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Microsoft_Windows_NT_3.1_logo_with_wordmark.svg/86px-Microsoft_Windows_NT_3.1_logo_with_wordmark.svg.png" decoding="async" width="86" height="100" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Microsoft_Windows_NT_3.1_logo_with_wordmark.svg/130px-Microsoft_Windows_NT_3.1_logo_with_wordmark.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Microsoft_Windows_NT_3.1_logo_with_wordmark.svg/173px-Microsoft_Windows_NT_3.1_logo_with_wordmark.svg.png 2x" data-file-width="510" data-file-height="590" /></a></td></tr><tr><td colspan="2" class="infobox-image"><a href="/wiki/File:Windows_NT_3.1.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/en/thumb/c/ca/Windows_NT_3.1.png/300px-Windows_NT_3.1.png" decoding="async" width="300" height="225" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/c/ca/Windows_NT_3.1.png 1.5x" data-file-width="400" data-file-height="300" /></a><div class="infobox-caption">Screenshot of Windows NT 3.1</div></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Programmer" title="Programmer">Developer</a></th><td class="infobox-data"><a href="/wiki/Microsoft" title="Microsoft">Microsoft</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">OS family</th><td class="infobox-data"><a href="/wiki/Microsoft_Windows" title="Microsoft Windows">Microsoft Windows</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Source model</th><td class="infobox-data"><a href="/wiki/Closed-source" class="mw-redirect" title="Closed-source">Closed-source</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_release_life_cycle#RTM" title="Software release life cycle">Released to manufacturing</a></th><td class="infobox-data">July 27, 1993; 31 years ago (1993-07-27)<a href="#cite_note-1">[1]</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_release_life_cycle" title="Software release life cycle">Latest release</a></th><td class="infobox-data">Service Pack 3 (3.1.528) / October 29, 1994; 30 years ago (1994-10-29)</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Platforms</th><td class="infobox-data"><a href="/wiki/IA-32" title="IA-32">IA-32</a>, <a href="/wiki/DEC_Alpha" title="DEC Alpha">Alpha</a>, <a href="/wiki/MIPS_architecture" title="MIPS architecture">MIPS</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Kernel_(operating_system)" title="Kernel (operating system)">Kernel</a> type</th><td class="infobox-data"><a href="/wiki/Hybrid_kernel" title="Hybrid kernel">Hybrid</a> (<a href="/wiki/Windows_NT_kernel" class="mw-redirect" title="Windows NT kernel">NT</a>)</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/User_space_and_kernel_space" title="User space and kernel space">Userland</a></th><td class="infobox-data"><style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style><div class="plainlist"><ul><li><a href="/wiki/Windows_API" title="Windows API">Windows API</a></li><li><a href="/wiki/NTVDM" class="mw-redirect" title="NTVDM">NTVDM</a></li><li><a href="/wiki/Microsoft_OS/2_subsystem" class="mw-redirect" title="Microsoft OS/2 subsystem">OS/2 1.x</a></li><li><a href="/wiki/Microsoft_POSIX_subsystem" title="Microsoft POSIX subsystem">POSIX.1</a></li></ul></div></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_license" title="Software license">License</a></th><td class="infobox-data"><a href="/wiki/Commercial_software" title="Commercial software">Commercial software</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Preceded by</th><td class="infobox-data"><a href="/wiki/Windows_3.1x" class="mw-redirect" title="Windows 3.1x">Windows 3.1x</a> (1992)</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Succeeded by</th><td class="infobox-data"><a href="/wiki/Windows_NT_3.5" title="Windows NT 3.5">Windows NT 3.5</a> (1994)</td></tr><tr><th colspan="2" class="infobox-header">Support status</th></tr><tr><td colspan="2" class="infobox-full-data">Unsupported as of December 31, 2000<a href="#cite_note-2">[2]</a></td></tr></tbody></table> Windows NT 3.1 is the first major release of the <a href="/wiki/Windows_NT" title="Windows NT">Windows NT</a> <a href="/wiki/Operating_system" title="Operating system">operating system</a> developed by <a href="/wiki/Microsoft" title="Microsoft">Microsoft</a>, released on July 27, 1993. It was the company's first <a href="/wiki/32-bit_computing" title="32-bit computing">32-bit</a> operating system, providing advantages over the constrictive <a href="/wiki/16-bit_architecture" class="mw-redirect" title="16-bit architecture">16-bit architecture</a> of previous versions of Windows that relied on <a href="/wiki/DOS" title="DOS">DOS</a>, but retaining a <a href="/wiki/Desktop_environment" title="Desktop environment">desktop environment</a> familiar to <a href="/wiki/Windows_3.1" title="Windows 3.1">Windows 3.1</a> users. Windows NT began as a rewrite of the <a href="/wiki/OS/2" title="OS/2">OS/2</a> operating system, which Microsoft had co-developed with <a href="/wiki/IBM" title="IBM">IBM</a> in the 1980s. For several reasons, including the market success of <a href="/wiki/Windows_3.0" title="Windows 3.0">Windows 3.0</a> in 1990, Microsoft decided to advance Windows rather than OS/2 and relinquished their OS/2 development responsibilities. By <a href="/wiki/Brand_extension" title="Brand extension">extending</a> the Windows brand and beginning NT at <a href="/wiki/Software_versioning" title="Software versioning">version</a> 3.1, like Windows 3.1 which had established <a href="/wiki/Brand_recognition" class="mw-redirect" title="Brand recognition">brand recognition</a> and <a href="/wiki/Market_share" title="Market share">market share</a>, Microsoft implied that consumers should expect a familiar <a href="/wiki/User_experience" title="User experience">user experience</a>. The name Windows NT ("New Technology") advertised that this was a re-engineered version of Windows. First publicly demonstrated at <a href="/wiki/COMDEX" title="COMDEX">Comdex</a> 1991, NT 3.1 was finally released in 1993, available in two editions: Windows NT 3.1 for <a href="/wiki/Workstation" title="Workstation">workstations</a>, and Windows NT 3.1 Advanced Server for <a href="/wiki/Server_(computing)" title="Server (computing)">servers</a>. When Windows NT premiered, their sales were limited by high <a href="#System_requirements">system requirements</a>, and a general lack of 32-bit <a href="/wiki/Application_software" title="Application software">applications</a> to take advantage of the OS's data processing capabilities. It sold about 300,000 copies before it was succeeded by <a href="/wiki/Windows_NT_3.5" title="Windows NT 3.5">Windows NT 3.5</a> in 1994. On December 31, 2000, Microsoft declared Windows NT 3.1 obsolete and stopped providing support and updates for the system. <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Development_history">Development history</h2>[<a href="/w/index.php?title=Windows_NT_3.1&action=edit&section=1" title="Edit section: Development history">edit</a>]</div> The origins of Windows NT date back to 1988,<a href="#cite_note-:0-3">[3]</a> where Microsoft had a major foothold on the <a href="/wiki/Personal_computer" title="Personal computer">personal computer</a> market due to the use of its <a href="/wiki/MS-DOS" title="MS-DOS">MS-DOS</a> as the operating system of <a href="/wiki/IBM_PC_compatible" class="mw-redirect" title="IBM PC compatible">IBM PC compatibles</a>. <a href="/wiki/Nathan_Myhrvold" title="Nathan Myhrvold">Nathan Myhrvold</a>, who had joined Microsoft after its acquisition of Dynamical Systems Research, identified two major threats to Microsoft's monopoly—<a href="/wiki/Reduced_instruction_set_computing" class="mw-redirect" title="Reduced instruction set computing">RISC</a> architectures, which proved to be more powerful than the equivalent <a href="/wiki/Intel" title="Intel">Intel</a> processors that MS-DOS ran on, and <a href="/wiki/Unix" title="Unix">Unix</a>, a family of <a href="/wiki/Cross-platform" class="mw-redirect" title="Cross-platform">cross-platform</a> <a href="/wiki/Computer_multitasking" title="Computer multitasking">multitasking</a> operating systems with support for <a href="/wiki/Multiprocessing" title="Multiprocessing">multiprocessing</a> and <a href="/wiki/Computer_network" title="Computer network">networking</a>.<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 34  While the widespread use of Unix was hindered by the need to adapt programs for each individual variant, <a href="/wiki/Bill_Gates" title="Bill Gates">Bill Gates</a> believed that the combination of a Unix-like operating system with RISC processors could be a market threat, prompting the need for Microsoft to develop a "Unix killer" that could run on multiple architectures.<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 35  Myhrvold wanted to develop a new system that would run on RISC workstations and <a href="/wiki/Intel" title="Intel">Intel</a> <a href="/wiki/Computer_chip" class="mw-redirect" title="Computer chip">chips</a> and <a href="/wiki/Multiprocessing" title="Multiprocessing">multiprocessing</a> computers.<a href="#cite_note-:0-3">[3]</a> Gates had also hired <a href="/wiki/Dave_Cutler" title="Dave Cutler">Dave Cutler</a> from <a href="/wiki/Digital_Equipment_Corporation" title="Digital Equipment Corporation">Digital Equipment Corporation</a> to assist in developing the new operating system; Cutler left DEC after the cancellation of the <a href="/wiki/DEC_PRISM" title="DEC PRISM">PRISM</a> architecture and its <a href="/wiki/DEC_MICA" title="DEC MICA">MICA</a> operating system, and agreed to join Microsoft on the condition that he be able to bring a number of staff members from his team at DEC with him.<a href="#cite_note-:0-3">[3]</a><a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 17–37  Cutler arrived at Microsoft in October 1988, and began working on the development of the operating system in November.<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 38 <a href="#cite_note-smith-5">[5]</a> The operating system was first developed as a revised version of <a href="/wiki/OS/2" title="OS/2">OS/2</a>, an operating system Microsoft had jointly developed with <a href="/wiki/IBM" title="IBM">IBM</a>.<a href="#cite_note-Custer1993-6">[6]</a>: 43–44  While OS/2 was originally intended to succeed MS-DOS, it had yet to be commercially successful. The OS was to be designed so it could be <a href="/wiki/Porting" title="Porting">ported</a> to different processor platforms, and support multiprocessor systems, which few operating systems did at that time.<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 33 <a href="#cite_note-Custer1993-6">[6]</a>: 2 <a href="#cite_note-handbook-7">[7]</a> To target the enterprise market, the OS was also to support networking, the <a href="/wiki/POSIX" title="POSIX">POSIX</a> standard, and a security platform compliant with the "<a href="/wiki/Trusted_Computer_System_Evaluation_Criteria" title="Trusted Computer System Evaluation Criteria">Orange Book</a>" standards; which would require the OS to be a <a href="/wiki/Multi-user" class="mw-redirect" title="Multi-user">multi-user</a> system with a permission framework and the ability to audit security-related events.<a href="#cite_note-usdod-8">[8]</a> Both Microsoft and IBM wanted to market an operating system that appealed to corporate "<a href="/wiki/Enterprise_software" title="Enterprise software">enterprise software</a>" customers. That meant greater <a href="/wiki/Computer_security" title="Computer security">security</a>, <a href="/wiki/Reliability_engineering" title="Reliability engineering">reliability</a>, processing power, and <a href="/wiki/Computer_networking" class="mw-redirect" title="Computer networking">computer networking</a> features. However, since Microsoft also wanted to capture market share from Unix on other <a href="/wiki/Computing_platforms" class="mw-redirect" title="Computing platforms">computing platforms</a>, they needed a <a href="/wiki/Systems_design" title="Systems design">system design</a> that was more <a href="/wiki/Software_portability" title="Software portability">portable</a> than that of OS/2. To this end, Microsoft began by developing and testing their new operating system for a non-<a href="/wiki/X86" title="X86">x86</a> processor: an <a href="/wiki/Emulator" title="Emulator">emulated</a> version of the <a href="/wiki/Intel_i860" title="Intel i860">Intel i860</a>. Alluding to the chip's codename, "N10", Microsoft codenamed their operating system NT OS/2.<a href="#cite_note-thurrott-9">[9]</a> DEC preemptively sued Microsoft, alleging that they stole code from MICA for use in the new operating system. In an out-of-court settlement, Microsoft agreed to make NT OS/2 compatible with DEC's <a href="/wiki/DEC_Alpha" title="DEC Alpha">Alpha processor</a>.<a href="#cite_note-smith-5">[5]</a> The development team originally estimated that development would be complete within 18 months. By April 1989, the NT OS/2 kernel could run inside the i860 emulator. However, the development team later determined that the i860 was unsuitable for the project. By December they had begun porting NT OS/2 to the <a href="/wiki/MIPS_architecture" title="MIPS architecture">MIPS</a> <a href="/wiki/R3000" title="R3000">R3000</a> processor instead, and completed the task in three months.<a href="#cite_note-thurrott-9">[9]</a> Senior Microsoft executive <a href="/wiki/Paul_Maritz" title="Paul Maritz">Paul Maritz</a> was targeting a release date in 1992, but the development schedule was uncertain. The company was eager to silence naysayers who speculated that NT wouldn't be on the market until 1994, and had planned to present the new OS at <a href="/wiki/COMDEX" title="COMDEX">COMDEX</a> in 1990.<a href="#cite_note-Custer1993-6">[6]</a>: 84–85  <div class="mw-heading mw-heading3"><h3 id="As_Windows_NT">As Windows NT</h3>[<a href="/w/index.php?title=Windows_NT_3.1&action=edit&section=2" title="Edit section: As Windows NT">edit</a>]</div> In May 1990, Microsoft released <a href="/wiki/Windows_3.0" title="Windows 3.0">Windows 3.0</a>, a new version of its MS-DOS-based <a href="/wiki/Microsoft_Windows" title="Microsoft Windows">Windows</a> <a href="/wiki/Desktop_environment" title="Desktop environment">desktop environment</a>. Windows 3.0 sold well, and the resulting shift in Microsoft's marketing strategy eroded their partnership with IBM—who wanted Microsoft to concentrate solely on developing OS/2 as its primary platform as opposed to building their future business around Windows.<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 100  Users and developers were unsure of whether to adopt Windows or OS/2 due to these uncertainties (a situation magnified by the fact that the operating systems were incompatible with each other at the <a href="/wiki/Application_programming_interface" class="mw-redirect" title="Application programming interface">API</a> level), while Microsoft's resources were also being drained by the simultaneous development of multiple operating systems.<a href="#cite_note-Custer1993-6">[6]</a>: 98–99 <a href="#cite_note-IW27May1991_S66-10">[10]</a> In August 1990, as a response to the popularity of Windows 3.0, the NT OS/2 team decided to re-work the operating system to use an extended <a href="/wiki/32-bit" class="mw-redirect" title="32-bit">32-bit</a> port of the <a href="/wiki/Windows_API" title="Windows API">Windows API</a> known as Win32. Win32 maintained the familiar structure of the <a href="/wiki/16-bit" class="mw-redirect" title="16-bit">16-bit</a> APIs used by Windows, which would allow developers to easily adapt their software for the new platform while maintaining a level of compatibility with existing software for Windows.<a href="#cite_note-IW8Jul1991_S1_103-11">[11]</a> With the shift to a Windows-like architecture, the operating system's <a href="/wiki/Shell_(computing)" title="Shell (computing)">shell</a> was also changed from OS/2's <a href="/wiki/Presentation_Manager" title="Presentation Manager">Presentation Manager</a> to Windows' <a href="/wiki/Program_Manager" title="Program Manager">Program Manager</a>.<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 102–105  Due to these changes, NT was not presented at COMDEX 1990 as was originally planned.<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 102  Neither the general public nor IBM knew about the transformation of NT OS/2 into Windows NT at the time.<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 108  Although the companies did agree to a revised partnership where IBM and Microsoft would alternate developing major versions of OS/2 instead of collaborating on each version,<a href="#cite_note-IW24Dec1990_S8-12">[12]</a> IBM eventually learned of Microsoft's Windows NT plans in January 1991, and immediately ended the OS/2 partnership. IBM would solely develop OS/2 2.0 (as was planned under the amended version) and all future versions, without any further involvement from Microsoft.<a href="#cite_note-Custer1993-6">[6]</a>: 108–109 <a href="#cite_note-IW8Jul1991_S1_103-11">[11]</a> In October 1991, Windows NT received its first public demonstration at COMDEX. In an effort to ensure software taking advantage of Windows NT was available upon its release (scheduled for late-1992), Microsoft also distributed a 32-bit <a href="/wiki/Software_development_kit" title="Software development kit">software development kit</a> to selected developers in attendance.<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 165 <a href="#cite_note-IW28Oct1991_S1_8-13">[13]</a> The demonstration was positively received; <a href="/wiki/PC_Magazine" class="mw-redirect" title="PC Magazine">PC Magazine</a> called Windows NT "the modern reinvention of the operating system", but at the same time claimed that it was unlikely that the promised <a href="/wiki/Backward_compatibility" title="Backward compatibility">backward compatibility</a> would be kept for the final release.<a href="#cite_note-Custer1993-6">[6]</a>: 175–176 <a href="#cite_note-PCMag26Nov1991_S8586-14">[14]</a> In March 1992, Microsoft also released <a href="/wiki/Win32s" title="Win32s">Win32s</a>, which would allow <a href="/wiki/Windows_3.1" title="Windows 3.1">Windows 3.1</a> to have partial compatibility with Windows NT programs for the purposes of developing software optimized for the platform.<a href="#cite_note-IW2Mar1992_S1_107-15">[15]</a> At Microsoft's <a href="/wiki/Professional_Developers_Conference" title="Professional Developers Conference">Win32 Professional Developers Conference</a> in June 1992, Windows NT was demonstrated running on x86 and MIPS processors, while a beta version of Windows NT and an updated development kit were also made available.<a href="#cite_note-IW13Jul1992_S1_92-16">[16]</a> Concurrently, Microsoft announced a new version of its <a href="/wiki/Microsoft_SQL_Server" title="Microsoft SQL Server">SQL Server</a> product for Windows NT; Unix vendors feared that the software could be a <a href="/wiki/Killer_app" class="mw-redirect" title="Killer app">killer app</a> that would affect the market share of Unix systems.<a href="#cite_note-IW20Jul1992_S8-17">[17]</a><a href="#cite_note-IW14Dec1992_S8-18">[18]</a> Concerns were also raised over NT's memory usage; while most computers of the era shipped with 4 megabytes of <a href="/wiki/Random-access_memory" title="Random-access memory">RAM</a>, 16 MB was recommended for NTs. Due to the high cost of RAM at the time, critics thought that its high system requirements could affect the sales and adoption of Windows NT. Steps were taken to reduce its memory usage through methods such as <a href="/wiki/Paging" class="mw-redirect" title="Paging">paging</a>.<a href="#cite_note-Custer1993-6">[6]</a>: 227–249  Microsoft began releasing public beta builds of NT in October 1992, and a month later at COMDEX, a presentation focusing on third-party software for Windows NT was held.<a href="#cite_note-IW12Oct1992_S17-19">[19]</a><a href="#cite_note-IW26Oct1992_S3-20">[20]</a><a href="#cite_note-IW23Nov1992_S3-21">[21]</a> The final pre-release version of NT was released in March 1993, alongside the unveiling of the server version, LAN Manager for Windows NT. Although its stability and performance had improved, there were still fears that the OS could be released in an unfinished state or delayed further into 1993.<a href="#cite_note-IW5Apr1993_S3-22">[22]</a><a href="#cite_note-IW31May1993_S13-23">[23]</a> By <a href="/wiki/Brand_extension" title="Brand extension">extending</a> the Windows brand and beginning NT at <a href="/wiki/Software_versioning" title="Software versioning">version</a> 3.1, like <a href="/wiki/Windows_3.1" title="Windows 3.1">Windows 3.1</a> which had established <a href="/wiki/Brand_recognition" class="mw-redirect" title="Brand recognition">brand recognition</a> and <a href="/wiki/Market_share" title="Market share">market share</a>, Microsoft implied that consumers should expect a familiar <a href="/wiki/User_experience" title="User experience">user experience</a> yet re-engineered. <div class="mw-heading mw-heading3"><h3 id="Release">Release</h3>[<a href="/w/index.php?title=Windows_NT_3.1&action=edit&section=3" title="Edit section: Release">edit</a>]</div> Windows NT 3.1 and Windows NT 3.1 Advanced Server (so numbered to associate them with <a href="/wiki/Windows_3.1" title="Windows 3.1">Windows 3.1</a>) were released on July 26, 1993.<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 300  At first, only the x86 and MIPS versions shipped; the DEC Alpha version followed in September.<a href="#cite_note-thurrott-9">[9]</a><a href="#cite_note-IW20Sep1993_S3-24">[24]</a> Microsoft sold the workstation version for $495, and the server version for $1,495. Ostensibly, the server price was meant to be a promotional discount offered only during the first six months of sale, but they never raised the retail price to the listed one—$2,995.<a href="#cite_note-IW31May1993_S1-25">[25]</a><a href="#cite_note-IW19Sep1994_S5-26">[26]</a> 250 programmers<a href="#cite_note-IW24May1993_S92-27">[27]</a> wrote 5.6 million <a href="/wiki/Lines_of_code" class="mw-redirect" title="Lines of code">lines of code</a>;<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 290  the development cost $150 million.<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 307  In the last year of development, the team fixed more than 30,000 bugs.<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 300  During the product's lifecycle, Microsoft published three <a href="/wiki/Service_pack" title="Service pack">service packs</a>: Service Pack 1 was released on October 8, 1993; Service Pack 2 followed on January 24, 1994; and Service Pack 3's release date was October 29, 1994. The service packs were distributed on CD-ROM and floppy disk, and also through <a href="/wiki/Bulletin_board_system" title="Bulletin board system">bulletin board systems</a>, <a href="/wiki/CompuServe" title="CompuServe">CompuServe</a>, and the <a href="/wiki/Internet" title="Internet">Internet</a>. Microsoft terminated support for the operating system on December 31, 2000. Support for Windows NT 3.1 RTM (without a service pack) ended on January 8, 1994. Service Pack 1 support ended on April 24, 1994, and finally, Service Pack 2 support ended on January 29, 1995, only 1 year after general availability. Windows NT 3.1 was localized into various languages. Besides English, it was available in Dutch, French, German, Japanese, Spanish and Swedish. The version for workstations, but not Windows NT 3.1 Server, was additionally available in Danish, Finnish, Italian, Norwegian and Portuguese.<a href="#cite_note-mslocale-28">[28]</a> <div class="mw-heading mw-heading2"><h2 id="Operating_system_goals">Operating system goals</h2>[<a href="/w/index.php?title=Windows_NT_3.1&action=edit&section=4" title="Edit section: Operating system goals">edit</a>]</div> Cutler set three main goals for Windows NT. The first goal was portability: in contrast to previous operating systems, which were strongly tied to one architecture, Windows NT should be able to operate on multiple architectures.<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 53  To meet this goal, most of the operating systems, including the operating system core, had to be written in the <a href="/wiki/C_(programming_language)" title="C (programming language)">C programming language</a>.<a href="#cite_note-russinovich-29">[29]</a> During the planning phase it was clear that this would cause Windows NT to have higher memory consumption than all previous operating systems.<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 55  Besides the graphics system and parts of the networking system, which were written in <a href="/wiki/C%2B%2B" title="C++">C++</a>, only parts of the operating systems which required direct hardware access and performance critical functions were written in <a href="/wiki/Assembly_language" title="Assembly language">assembly language</a>. These parts were isolated so that they could easily be rewritten when porting the operating system to a new architecture.<a href="#cite_note-Custer1993-6">[6]</a>: 89  The second goal was <a href="/wiki/Reliability_engineering" title="Reliability engineering">reliability</a>: The system should no longer crash due to a faulty application or faulty hardware.<a href="#cite_note-Custer1993-6">[6]</a>: 9  This way, the operating system should be made attractive for critical applications.<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 54  To meet this goal, the architecture of Windows NT was designed so that the operating system core was isolated and applications could not access it directly.<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 56  The kernel was designed as a <a href="/wiki/Microkernel" title="Microkernel">microkernel</a> and components of the core were to run atop the kernel in a modular fashion; Cutler knew this principle from his work at Digital.<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 57  Reliability also includes security, and the operating system should be able to resist external attacks.<a href="#cite_note-Custer1993-6">[6]</a>: 9  <a href="/wiki/Mainframe_computer" title="Mainframe computer">Mainframes</a> already had a system where every user had their own account which was assigned specific rights by the <a href="/wiki/Sysop" title="Sysop">administrator</a>, this way, users could be prevented access to confidential documents.<a href="#cite_note-Custer1993-6">[6]</a>: 157–158  A <a href="/wiki/Virtual_memory" title="Virtual memory">virtual memory</a> management was designed to thwart attacks by <a href="/wiki/Malware" title="Malware">malware</a> and prevent users from accessing foreign areas of memory.<a href="#cite_note-Custer1993-6">[6]</a>: 10  The third goal was called personality: The operating system should be able to run applications designed for various operating systems, such as <a href="/wiki/Windows" class="mw-redirect" title="Windows">Windows</a>, MS-DOS and OS/2 applications.<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 54  The <a href="/wiki/Mach_kernel" class="mw-redirect" title="Mach kernel">Mach kernel</a> followed a similar concept by moving the APIs to components which operated in user mode as applications, these could be changed and new ones could be added. This principle was applied to Windows NT.<a href="#cite_note-Custer1993-6">[6]</a>: 6  Despite all these goals, the performance of the operating system was optimized where possible, by adapting critical sections of the code to fast execution speed. To improve networking performance, large parts of the networking system were moved to the operating system core.<a href="#cite_note-Custer1993-6">[6]</a>: 12  Windows NT was designed as a networking operating system. In this branch, <a href="/wiki/Novell" title="Novell">Novell</a> had a lead with its product NetWare, mostly because of a lack of competition, and Microsoft failed to develop a product which could challenge NetWare's lead. Cutler hoped to gain additional customers with a reliable networking operating system.<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 65  Bill Gates already dominated the market of desktop operating systems with MS-DOS and Windows and hoped to do the same in the networking market with Windows NT.<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 3  He especially hoped to find a market in the emerging number of servers, while at the same time he did not expect a success in the desktop market until 1995.<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 151  Therefore, Windows NT was positioned as a high-end operating system in an interview with the product manager David Thacher. It was not designed to replace Windows 3.1 completely, but it should rather supplement Microsoft's product palette with an operating system for critical applications. The expectations were 10% to 20% among all Windows sales<a href="#cite_note-IW24May1993_S92-27">[27]</a> and a market share of 10% in the high end market, which amounted to one million copies.<a href="#cite_note-IW24May1993_S85-30">[30]</a> <div class="mw-heading mw-heading2"><h2 id="Features">Features</h2>[<a href="/w/index.php?title=Windows_NT_3.1&action=edit&section=5" title="Edit section: Features">edit</a>]</div> <div class="mw-heading mw-heading3"><h3 id="Architecture">Architecture</h3>[<a href="/w/index.php?title=Windows_NT_3.1&action=edit&section=6" title="Edit section: Architecture">edit</a>]</div> While Windows NT 3.1 uses the same graphical user interface as Windows 3.1, it was developed anew. The operating system is not DOS-based, but an independent 32-bit operating system; many concepts were taken from Cutler's previous operating system, <a href="/wiki/OpenVMS" title="OpenVMS">VMS</a>.<a href="#cite_note-russinovich-29">[29]</a> The <a href="/wiki/Architecture_of_Windows_NT" title="Architecture of Windows NT">architecture of Windows NT</a> takes some ideas of the <a href="/wiki/Client%E2%80%93server_model" title="Client–server model">client–server model</a>, like the modular structure and the communication between the modules.<a href="#cite_note-Custer1993-6">[6]</a>: 20  System resources like memory, files or devices are viewed as <a href="/wiki/Object_(computer_science)" title="Object (computer science)">objects</a> by the operating system, which are all accessed in the same way through <a href="/wiki/Handle_(computing)" title="Handle (computing)">handles</a> and which can in this way be secured against unauthorized access.<a href="#cite_note-Custer1993-6">[6]</a>: 22–23  The operating system was designed for multiprocessor systems; it supports <a href="/wiki/Preemptive_multitasking" class="mw-redirect" title="Preemptive multitasking">preemptive multitasking</a><a href="#cite_note-Custer1993-6">[6]</a>: 92  and can make use of <a href="/wiki/Thread_(computing)" title="Thread (computing)">threads</a> to run multiple processes in parallel.<a href="#cite_note-Custer1993-6">[6]</a>: 94  Using <a href="/wiki/Symmetric_multiprocessing" title="Symmetric multiprocessing">symmetric multiprocessing</a>, the processing usage is evenly distributed among all available processors.<a href="#cite_note-Custer1993-6">[6]</a>: 24  The <a href="/wiki/Inter-process_communication" title="Inter-process communication">inter-process communication</a> in Windows NT 3.1 is designed around networks; two newly introduced functions, <a href="/wiki/Remote_Procedure_Call" class="mw-redirect" title="Remote Procedure Call">Remote Procedure Call</a> (RPC) and <a href="/wiki/Network_DDE" class="mw-redirect" title="Network DDE">Network DDE</a>, an extension of <a href="/wiki/Dynamic_Data_Exchange" title="Dynamic Data Exchange">Dynamic Data Exchange</a> (DDE), facilitate the access and data exchange between processes running on different computers inside a network.<a href="#cite_note-PCMag28Sep1993_S211-31">[31]</a> The operating system is designed to combine certain elements of a <a href="/wiki/Monolithic_kernel" title="Monolithic kernel">monolithic kernel</a> and a microkernel;<a href="#cite_note-Custer1993-6">[6]</a>: 20  nowadays this is most often referred to as a <a href="/wiki/Hybrid_kernel" title="Hybrid kernel">hybrid kernel</a>.<a href="#cite_note-mskernel-32">[32]</a> The <a href="/wiki/Hardware_abstraction_layer" class="mw-redirect" title="Hardware abstraction layer">hardware abstraction layer</a> represents the lowermost layer and isolates the operating system from the underlying hardware to make it easy to port the operating system to other platforms.<a href="#cite_note-Custer1993-6">[6]</a>: 30  The kernel running atop only has very basic functions like <a href="/wiki/Interrupt" title="Interrupt">interrupt</a> management and processor synchronization. All other functions of the operating system core are handled by modules<a href="#cite_note-Custer1993-6">[6]</a>: 20  which operate independently from one another and can be swapped without affecting the rest of the operating system.<a href="#cite_note-Custer1993-6">[6]</a>: 28  Positioned above the operating system core are the subsystems. There are two types of subsystems: one are the integral subsystems, which perform important operating system functions. One such subsystem is the security subsystem, which handles the logon process and monitors the security of the system. The other type of subsystem is the environment subsystem, which exposes the operating system functions to applications via <a href="/wiki/Application_programming_interface" class="mw-redirect" title="Application programming interface">application programming interfaces</a>.<a href="#cite_note-Custer1993-6">[6]</a>: 27  The base subsystem is the 32-bit subsystem which runs 32-bit applications written for Windows NT. Windows NT applications can only run on one platform, and must be recompiled for every platform. The 32-bit subsystem also contains all <a href="/wiki/Output_(computing)" class="mw-redirect" title="Output (computing)">output</a> functions, including the <a href="/wiki/Graphics_Device_Interface" title="Graphics Device Interface">Graphics Device Interface</a> (GDI),<a href="#cite_note-ct1993-33">[33]</a> so all other subsystems have to call the 32-bit subsystem to be able to output text or graphics.<a href="#cite_note-Custer1993-6">[6]</a>: 33  Other subsystems contained in Windows NT 3.1 are the POSIX subsystem, which supports POSIX-compatible applications built for Windows NT, and, in the x86 version only, the OS/2 subsystem, which allows command-line based OS/2 1.x applications to run.<a href="#cite_note-ct1993-33">[33]</a> The <a href="/wiki/Virtual_DOS_Machine" class="mw-redirect" title="Virtual DOS Machine">Virtual DOS Machine</a> (VDM) is sometimes also viewed as a subsystem, but is, strictly speaking, a normal 32-bit Windows application. It manages applications originally built for DOS. Built on top is <a href="/wiki/Windows_on_Windows" title="Windows on Windows">Windows on Windows</a> (WoW), which allows applications built for 16-bit Windows operating systems like Windows 3.1 to run. On x86 computers, the virtual DOS machine uses the <a href="/wiki/Virtual_8086_mode" title="Virtual 8086 mode">virtual 8086 mode</a> to run DOS applications directly,<a href="#cite_note-ct1993-33">[33]</a> on RISC computers, an emulator licensed from Insignia Solutions is used which emulates a <a href="/wiki/80286" class="mw-redirect" title="80286">80286</a> processor. However, not all DOS and 16-bit Windows applications can be run on Windows NT 3.1 due to various limitations,<a href="#cite_note-ct1994-34">[34]</a> one of them being the inability of applications to directly access the hardware. As well, <a href="/wiki/VxD" title="VxD">VxD</a> files sometimes needed by applications cannot be used with Windows NT 3.1.<a href="#cite_note-msq103012-35">[35]</a> While pure DOS applications are run in separate memory spaces, 16-bit Windows applications have to share one memory space. While this is done due to compatibility reasons with applications which depend on this ability, like <a href="/wiki/Schedule%2B" class="mw-redirect" title="Schedule+">Schedule+</a> and <a href="/wiki/Microsoft_Mail" title="Microsoft Mail">Microsoft Mail</a>, it also means that 16-bit Windows applications only run in <a href="/wiki/Cooperative_multitasking" title="Cooperative multitasking">cooperative multitasking</a>. A faulty 16-bit Windows application is in this way able to cause all other 16-bit Windows applications (but not Windows NT itself) to crash.<a href="#cite_note-ct1993-33">[33]</a> <figure class="mw-halign-center" typeof="mw:File/Thumb"><a href="/wiki/File:NT_3.1_layers.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/41/NT_3.1_layers.png/600px-NT_3.1_layers.png" decoding="async" width="600" height="377" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/41/NT_3.1_layers.png/900px-NT_3.1_layers.png 1.5x, //upload.wikimedia.org/wikipedia/commons/4/41/NT_3.1_layers.png 2x" data-file-width="954" data-file-height="600" /></a><figcaption>Graphical view of the architecture of Windows NT 3.1. Shown are the following components of the operating system core: I/O Manager, Object Manager, Security Reference Monitor, Process Manager, Local Procedure Call Facility, Virtual Memory Manager.<a href="#cite_note-Custer1993-6">[6]</a>: 26–33 </figcaption></figure> <div class="mw-heading mw-heading3"><h3 id="System">System</h3>[<a href="/w/index.php?title=Windows_NT_3.1&action=edit&section=7" title="Edit section: System">edit</a>]</div> Windows NT 3.1 provides a <a href="/wiki/Boot_manager" class="mw-redirect" title="Boot manager">boot manager</a> called <a href="/wiki/NTLDR" title="NTLDR">NTLDR</a> which is loaded during the startup process of the operating system on x86-based computers. It allows a multiboot setup of multiple instances of Windows NT 3.1, as well as MS-DOS and OS/2 1.x.<a href="#cite_note-msq106168-36">[36]</a> NTLDR is not used for the RISC versions because the RISC computers' firmware provides their own boot manager.<a href="#cite_note-msstartup-37">[37]</a> Every user has to log on to the computer after Windows NT 3.1 is booted up by pressing the key combination <a href="/wiki/Control-Alt-Delete" title="Control-Alt-Delete">Ctrl+Alt+Del</a> and entering the user name and password. All users have their own <a href="/wiki/User_account" class="mw-redirect" title="User account">user account</a>, and user-specific settings like the <a href="/wiki/Program_Manager" title="Program Manager">Program Manager</a> groups are stored separately for every user. Users can be assigned specific rights, like the right to change the system time or the right to shut down the computer. To facilitate management of user accounts, it is also possible to group multiple user accounts and assign rights to groups of users.<a href="#cite_note-ct1993-33">[33]</a> Windows NT 3.1 introduced the new <a href="/wiki/NTFS" title="NTFS">NTFS</a> file system. This new file system is more robust against hardware failures<a href="#cite_note-Custer1993-6">[6]</a>: 10  and allows assignment of read and write rights to users or groups on the file system level.<a href="#cite_note-ct1993-33">[33]</a> NTFS supports long file names<a href="#cite_note-ct1993-33">[33]</a> and has features to accommodate POSIX applications like <a href="/wiki/Hard_link" title="Hard link">hard links</a>.<a href="#cite_note-Custer1993-6">[6]</a>: 39  For compatibility reasons, Windows NT 3.1 also supports <a href="/wiki/FAT16" class="mw-redirect" title="FAT16">FAT16</a> as well as OS/2's file system <a href="/wiki/High_Performance_File_System" title="High Performance File System">HPFS</a>,<a href="#cite_note-ct1993-33">[33]</a> but does not support long file names on FAT file system (<a href="/wiki/VFAT" class="mw-redirect" title="VFAT">VFAT</a>). This was added in Windows NT 3.5. Designed as a networking operating system, Windows NT 3.1 supports multiple <a href="/wiki/Network_protocol" class="mw-redirect" title="Network protocol">network protocols</a>. Besides <a href="/wiki/IPX/SPX" title="IPX/SPX">IPX/SPX</a> and <a href="/wiki/NetBEUI" class="mw-redirect" title="NetBEUI">NetBEUI</a>, the <a href="/wiki/TCP/IP" class="mw-redirect" title="TCP/IP">TCP/IP</a> protocol is supported allowing access to the Internet.<a href="#cite_note-ct1993-33">[33]</a> Similar to Windows for Workgroups, files and printers can be shared and the access rights and configuration of these resources can be edited over the network. When a network printer is installed, the required drivers are automatically transferred over the network, removing the need to manually install the drivers for every computer.<a href="#cite_note-ct1993-33">[33]</a> The <a href="/wiki/Remote_Access_Service" class="mw-redirect" title="Remote Access Service">Remote Access Service</a> (RAS) allows a client from outside the network to connect to the network using a <a href="/wiki/Modem" title="Modem">modem</a>, <a href="/wiki/ISDN" title="ISDN">ISDN</a> or <a href="/wiki/X.25" title="X.25">X.25</a> and access its resources. While the workstation allows one RAS connection at a time, the server supports 64.<a href="#cite_note-ct1993-33">[33]</a> Windows NT 3.1 supports the then-new <a href="/wiki/Unicode" title="Unicode">Unicode</a> standard, a <a href="/wiki/Character_set" class="mw-redirect" title="Character set">character set</a> which allows multiple languages to be displayed. This facilitates <a href="/wiki/Internationalization_and_localization" title="Internationalization and localization">localization</a> of the operating system.<a href="#cite_note-msq99884-38">[38]</a> All strings, as well as file and folder names, are internally processed in Unicode,<a href="#cite_note-Custer1993-6">[6]</a>: 43  but the included programs, like the <a href="/wiki/File_Manager" class="mw-redirect" title="File Manager">File Manager</a>, are not Unicode aware, so folders containing Unicode characters cannot be accessed.<a href="#cite_note-msq102384-39">[39]</a> For demonstration purposes, a <a href="/wiki/Unicode_typeface" class="mw-redirect" title="Unicode typeface">Unicode typeface</a> called <a href="/wiki/Lucida" title="Lucida">Lucida</a> Sans Unicode is shipped with Windows NT 3.1<a href="#cite_note-bigelow-40">[40]</a> even though it is not installed by default. The previous <a href="/wiki/Code_page" title="Code page">code pages</a> are still supported for compatibility purposes.<a href="#cite_note-msq99884-38">[38]</a> The <a href="/wiki/Windows_registry" class="mw-redirect" title="Windows registry">Windows registry</a>, introduced with Windows 3.1, is a central, hierarchical configuration database<a href="#cite_note-ct1993-33">[33]</a> designed to allow configuration of computers over the network<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 251  and to replace the commonly-used text-based configuration files, like <a href="/wiki/INI_file" title="INI file">INI files</a>, <a href="/wiki/AUTOEXEC.BAT" title="AUTOEXEC.BAT">AUTOEXEC.BAT</a> and <a href="/wiki/CONFIG.SYS" title="CONFIG.SYS">CONFIG.SYS</a>.<a href="#cite_note-Custer1993-6">[6]</a>: 327  Using the undocumented registry editor, the Windows registry can be viewed and edited by the user.<a href="#cite_note-ct1993-33">[33]</a> The Advanced Server is designed to manage the workstation computers.<a href="#cite_note-ct1993-33">[33]</a> It can function as a <a href="/wiki/Domain_controller" title="Domain controller">Domain controller</a>, where all users and groups as well as their rights are stored. This way, a user can log on from any computer in the network, and users can be managed centrally on the server. Trust relationships can be built to other domains to be able to exchange data cross-domain.<a href="#cite_note-ct1993-33">[33]</a> Using the <a href="/wiki/Replication_(computing)" title="Replication (computing)">replication</a> service, files like logon scripts can be synchronized across all computers on the network. The Advanced Server supports the <a href="/wiki/AppleTalk" title="AppleTalk">AppleTalk</a> protocol to allow connections to Macintosh computers.<a href="#cite_note-ct1993-33">[33]</a> Hard drives can be combined to <a href="/wiki/RAID" title="RAID">RAIDs</a> in Windows NT 3.1 Advanced Server, the supported configurations are RAID 0, RAID 1 and RAID 5. <div class="mw-heading mw-heading3"><h3 id="Included_programs">Included programs</h3>[<a href="/w/index.php?title=Windows_NT_3.1&action=edit&section=8" title="Edit section: Included programs">edit</a>]</div> Windows NT 3.1, for the most part, comes with 32-bit versions of the components featured in Windows 3.1 and Windows for Workgroups. However, it also included applications specifically aimed at the needs of Windows NT, like the User Manager, the <a href="/wiki/Performance_Monitor" title="Performance Monitor">Performance Monitor</a>, the Disk Administrator, the <a href="/wiki/Event_Viewer" title="Event Viewer">Event Viewer</a> and the Backup application. The Advanced Server contained further, server-specific administration tools. Because Windows NT 3.1 is not DOS-based, a new 32-bit command-line processor, called <a href="/wiki/CMD.EXE" class="mw-redirect" title="CMD.EXE">CMD.EXE</a> was included which was compatible with MS-DOS 5.0.<a href="#cite_note-ct1993-33">[33]</a> For compatibility reasons, Windows NT 3.1 shipped with a few 16-bit applications, like <a href="/wiki/Microsoft_Write" title="Microsoft Write">Microsoft Write</a> or <a href="/wiki/EDLIN" class="mw-redirect" title="EDLIN">EDLIN</a>.<a href="#cite_note-msq101929-41">[41]</a> Windows NT 3.1, being an all-new operating system for which no previous drivers could be used, includes a wealth of drivers for various common components and peripherals.<a href="#cite_note-ct1994-34">[34]</a> This includes common <a href="/wiki/SCSI" title="SCSI">SCSI</a> devices like hard drives, CD-ROM drives, <a href="/wiki/Tape_drive" title="Tape drive">tape drives</a> and <a href="/wiki/Image_scanner" title="Image scanner">image scanners</a>,<a href="#cite_note-msq103284-42">[42]</a> as well as <a href="/wiki/Industry_Standard_Architecture" title="Industry Standard Architecture">ISA</a> devices like graphics cards, sound cards and network cards. The <a href="/wiki/Conventional_PCI" class="mw-redirect" title="Conventional PCI">PCI bus</a>, however, is expressly not supported.<a href="#cite_note-msq113345-43">[43]</a> Windows NT 3.1 supports an <a href="/wiki/Uninterruptible_power_supply" title="Uninterruptible power supply">uninterruptible power supply</a>.<a href="#cite_note-Custer1993-6">[6]</a>: 328  Windows NT 3.1 could be installed either by using the CD-ROM and a provided <a href="/wiki/Boot_disk" title="Boot disk">boot disk</a>, or by utilizing a set of twenty-two 3.5" floppies (twenty-three floppies for Advanced Server). Windows NT 3.1 could also be installed over the network.<a href="#cite_note-ct1993-33">[33]</a> A coupon was included that made it possible to order a set of twenty-seven 5.25" floppies (or twenty-eight floppies for Advanced Server).<a href="#cite_note-computinghistory-44">[44]</a> Compared to the floppies, the CD-ROM contained additional drivers and applications. <div class="mw-heading mw-heading2"><h2 id="System_requirements">System requirements</h2>[<a href="/w/index.php?title=Windows_NT_3.1&action=edit&section=9" title="Edit section: System requirements">edit</a>]</div> Windows NT 3.1 supports multiple platforms: Aside from the x86 architecture, it runs on computers with <a href="/wiki/DEC_Alpha" title="DEC Alpha">DEC Alpha</a> or <a href="/wiki/MIPS_Technologies" title="MIPS Technologies">MIPS</a> (<a href="/wiki/R4000" title="R4000">R4000</a> and <a href="/wiki/R4400" class="mw-redirect" title="R4400">R4400</a>) processors.<a href="#cite_note-IW6Dec1993_S15-45">[45]</a> Minimum system requirements on x86 systems include a 25 MHz <a href="/wiki/80386" class="mw-redirect" title="80386">80386</a> processor, at least 12 megabytes of memory, 75 megabytes of hard drive space, and a VGA graphics card. <a href="/wiki/RISC" class="mw-redirect" title="RISC">RISC</a> systems require 16 megabytes of memory, 92 megabytes of hard drive space, and a CD-ROM drive.<a href="#cite_note-winhistory-46">[46]</a> The Advanced Server edition requires an 80386 processor with 16 megabytes of memory and 90 megabytes of hard drive space. On RISC systems, 110 megabytes of hard drive space is needed.<a href="#cite_note-IW15Nov1993_S138-47">[47]</a> Windows NT 3.1 supports dual processor systems, while the Advanced Server edition supports up to four processors. Due to an error in the processor detection routine, Windows NT 3.1 cannot be installed on <a href="/wiki/Pentium_II" title="Pentium II">Pentium II</a> or newer processors. Microsoft never fixed the problem, but <a href="/wiki/Unofficial_patch" title="Unofficial patch">unofficial patches</a> are available.<a href="#cite_note-winhistory-46">[46]</a> <div class="mw-heading mw-heading2"><h2 id="Reception">Reception</h2>[<a href="/w/index.php?title=Windows_NT_3.1&action=edit&section=10" title="Edit section: Reception">edit</a>]</div> Windows NT 3.1 sold about 300,000 copies in its first year.<a href="#cite_note-ctrueckblick-48">[48]</a> The hardware requirements were deemed to be very high at that time; the recommended system requirements of a 486 processor with 16 megabytes of memory were well above the average computer's configuration,<a href="#cite_note-ct1994-34">[34]</a> and the operating system turned out to be too slow to use.<a href="#cite_note-IW16Aug1993_S1-49">[49]</a> 32-bit applications which could have used the capabilities of Windows NT 3.1 were scarce, so users had to resort to the old 16-bit applications; however, these ran slower than on Windows 3.1. Estimates in November 1993 counted only 150 Windows NT applications.<a href="#cite_note-IW15Nov1993_S84-50">[50]</a> Common types of software, like <a href="/wiki/Office_suite" class="mw-redirect" title="Office suite">office suites</a>, were not available for Windows NT 3.1.<a href="#cite_note-ct1994-34">[34]</a> During the development of the operating system, the API calls were changed so 32-bit applications built on the 1992 pre-release version of Windows NT 3.1 could not be run on the final version. This affected software such as <a href="/wiki/Microsoft_Visual_C%2B%2B" title="Microsoft Visual C++">Microsoft Visual C++</a> 1.0 and Microsoft Fortran PowerStation.<a href="#cite_note-msq103621-51">[51]</a> RISC systems with Windows NT 3.1 had an even bigger disadvantage: even though they were more powerful than x86 systems,<a href="#cite_note-PCMag28Sep1993_S211-31">[31]</a> almost no 32-bit applications or drivers were ported to these platforms.<a href="#cite_note-ctrueckblick-48">[48]</a> 16-bit applications ran much slower under RISC systems because of the 80286 emulation compared to x86 systems which could run 16-bit applications natively,<a href="#cite_note-PCMag28Sep1993_S211-31">[31]</a> and DOS and 16-bit applications which depended on 386 calls could not be run at all on RISC systems. However, not all reception was negative; the multitasking capabilities of the operating system were rated positively, especially compared to Windows 3.1.<a href="#cite_note-ct1993-33">[33]</a> Compared to the size of the operating system, the installation turned out to be very easy, even though installing from floppies was a very time-consuming task.<a href="#cite_note-IW15Nov1993_S96-52">[52]</a> The Advanced Server, intended to be the successor to the unsuccessful <a href="/wiki/LAN_Manager" title="LAN Manager">LAN Manager</a> product, was technically much superior to its predecessor, and only failed to gain success because it shared the same problems with its workstation pendant, such as the low performance running 16-bit applications.<a href="#cite_note-IW15Nov1993_S81-53">[53]</a> The Advanced Server provided a financial advantage for large networks because its price was not dependent on the number of clients, unlike its competitor Novell NetWare.<a href="#cite_note-IW15Nov1993_S138-47">[47]</a> With Windows NT, Microsoft entered a market it could not previously address and which was mostly dominated by Unix, Novell NetWare and OS/2.<a href="#cite_note-IW15Nov1993_S77-54">[54]</a> A test performed by the <a href="/wiki/InfoWorld" title="InfoWorld">InfoWorld</a> magazine in November 1993, where the networking capabilities of several operating systems were tested, showed that Windows NT 3.1 was seriously lacking in inter-client communication: it could only connect to its own server via <a href="/wiki/NetBEUI" class="mw-redirect" title="NetBEUI">NetBEUI</a>; attempts to connect to Unix, NetWare and OS/2 all failed because no client software was available. For the Advanced Server, only their own client, the Macintosh and, if only limited, OS/2 were able to connect to the server.<a href="#cite_note-IW15Nov1993_S124-55">[55]</a> Even though the operating system's actual success was only moderate, it had a huge lasting impact. Developers of Unix derivations for the first time strived to standardize their operating systems, and Novell was so concerned about its market share that it bought a Unix vendor.<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 303  Manufacturers of <a href="/wiki/Microprocessor" title="Microprocessor">microprocessors</a> hoped to use the portability of the new operating system to increase their own sales,<a href="#cite_note-ZacharyShowstopper-4">[4]</a>: 303  and thus ports of Windows NT were announced for various platforms, like the <a href="/wiki/Sun_SPARC" class="mw-redirect" title="Sun SPARC">Sun SPARC</a> architecture<a href="#cite_note-IW12Jul1993_S8-56">[56]</a> and the <a href="/wiki/Clipper_architecture" title="Clipper architecture">Clipper architecture</a>.<a href="#cite_note-IW23Nov1992_S16-57">[57]</a> It was recognized that Windows NT would dominate the desktop market as soon as the hardware became powerful enough to run the operating system at an acceptable speed.<a href="#cite_note-IW22Nov1993_S66-58">[58]</a> Eight years later, Microsoft would unify the consumer-oriented Windows line (which had remained MS-DOS based) with the NT line with the October 2001 release of <a href="/wiki/Windows_XP" title="Windows XP">Windows XP</a>—the first consumer-oriented version of Windows to use the NT architecture.<a href="#cite_note-cnet-xpreview-59">[59]</a> <div class="mw-heading mw-heading2"><h2 id="References">References</h2>[<a href="/w/index.php?title=Windows_NT_3.1&action=edit&section=11" title="Edit section: References">edit</a>]</div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-1"><a href="#cite_ref-1">^</a> <style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFPaul_Adams2009" class="citation web cs1">Paul Adams (August 4, 2009). <a rel="nofollow" class="external text" href="http://blogs.technet.com/b/mrsnrub/archive/2009/08/04/windows-nt-history.aspx">"Windows NT History"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Windows+NT+History&rft.date=2009-08-04&rft.au=Paul+Adams&rft_id=http%3A%2F%2Fblogs.technet.com%2Fb%2Fmrsnrub%2Farchive%2F2009%2F08%2F04%2Fwindows-nt-history.aspx&rfr_id=info%3Asid%2Fen.wikipedia.org%3AWindows+NT+3.1" class="Z3988"> </li> <li id="cite_note-2"><a href="#cite_ref-2">^</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20040611115848/http://support.microsoft.com/default.aspx?scid=fh;%5bln%5d;LifeWin">"Product Lifecycle Dates - Windows Product Family"</a>. Microsoft. Archived from <a rel="nofollow" class="external text" href="http://support.microsoft.com/default.aspx?scid=fh;%5bln%5d;LifeWin">the original</a> on June 11, 2004. Retrieved August 24, 2021.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Microsoft&rft.atitle=Product+Lifecycle+Dates+-+Windows+Product+Family&rft_id=http%3A%2F%2Fsupport.microsoft.com%2Fdefault.aspx%3Fscid%3Dfh%3B%255bln%255d%3BLifeWin&rfr_id=info%3Asid%2Fen.wikipedia.org%3AWindows+NT+3.1" class="Z3988"> </li> <li id="cite_note-:0-3">^ <a href="#cite_ref-:0_3-0">a</a> <a href="#cite_ref-:0_3-1">b</a> <a href="#cite_ref-:0_3-2">c</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFCusumano1998" class="citation book cs1">Cusumano, Michael A. (1998). <a rel="nofollow" class="external text" href="https://www.worldcat.org/oclc/40671451">Microsoft secrets: how the world's most powerful software company creates technology, shapes markets, and manages people</a>. Richard W. Selby (1 ed.). New York: Simon & Schuster. p. 144. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-684-85531-3" title="Special:BookSources/0-684-85531-3"><bdi>0-684-85531-3</bdi></a>. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/40671451">40671451</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Microsoft+secrets%3A+how+the+world%27s+most+powerful+software+company+creates+technology%2C+shapes+markets%2C+and+manages+people&rft.place=New+York&rft.pages=144&rft.edition=1&rft.pub=Simon+%26+Schuster&rft.date=1998&rft_id=info%3Aoclcnum%2F40671451&rft.isbn=0-684-85531-3&rft.aulast=Cusumano&rft.aufirst=Michael+A.&rft_id=https%3A%2F%2Fwww.worldcat.org%2Foclc%2F40671451&rfr_id=info%3Asid%2Fen.wikipedia.org%3AWindows+NT+3.1" class="Z3988"> </li> <li id="cite_note-ZacharyShowstopper-4">^ <a href="#cite_ref-ZacharyShowstopper_4-0">a</a> <a href="#cite_ref-ZacharyShowstopper_4-1">b</a> <a href="#cite_ref-ZacharyShowstopper_4-2">c</a> <a href="#cite_ref-ZacharyShowstopper_4-3">d</a> <a href="#cite_ref-ZacharyShowstopper_4-4">e</a> <a href="#cite_ref-ZacharyShowstopper_4-5">f</a> <a href="#cite_ref-ZacharyShowstopper_4-6">g</a> <a href="#cite_ref-ZacharyShowstopper_4-7">h</a> <a href="#cite_ref-ZacharyShowstopper_4-8">i</a> <a href="#cite_ref-ZacharyShowstopper_4-9">j</a> <a href="#cite_ref-ZacharyShowstopper_4-10">k</a> <a href="#cite_ref-ZacharyShowstopper_4-11">l</a> <a href="#cite_ref-ZacharyShowstopper_4-12">m</a> <a href="#cite_ref-ZacharyShowstopper_4-13">n</a> <a href="#cite_ref-ZacharyShowstopper_4-14">o</a> <a href="#cite_ref-ZacharyShowstopper_4-15">p</a> <a href="#cite_ref-ZacharyShowstopper_4-16">q</a> <a href="#cite_ref-ZacharyShowstopper_4-17">r</a> <a href="#cite_ref-ZacharyShowstopper_4-18">s</a> <a href="#cite_ref-ZacharyShowstopper_4-19">t</a> <a href="#cite_ref-ZacharyShowstopper_4-20">u</a> <a href="#cite_ref-ZacharyShowstopper_4-21">v</a> <a href="#cite_ref-ZacharyShowstopper_4-22">w</a> <a href="#cite_ref-ZacharyShowstopper_4-23">x</a> <a href="#cite_ref-ZacharyShowstopper_4-24">y</a> <a href="#cite_ref-ZacharyShowstopper_4-25">z</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFZachary2009" class="citation book cs1">Zachary, G. Pascal (2009). Showstopper!: The breakneck race to create Windows NT and the next generation at Microsoft. New York: E-Rights/E-Reads. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-7592-8578-1" title="Special:BookSources/978-0-7592-8578-1"><bdi>978-0-7592-8578-1</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Showstopper%21%3A+The+breakneck+race+to+create+Windows+NT+and+the+next+generation+at+Microsoft&rft.place=New+York&rft.pub=E-Rights%2FE-Reads&rft.date=2009&rft.isbn=978-0-7592-8578-1&rft.aulast=Zachary&rft.aufirst=G.+Pascal&rfr_id=info%3Asid%2Fen.wikipedia.org%3AWindows+NT+3.1" class="Z3988"> </li> <li id="cite_note-smith-5">^ <a href="#cite_ref-smith_5-0">a</a> <a href="#cite_ref-smith_5-1">b</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSmith1999" class="citation web cs1">Smith, Mark (August 26, 1999). <a rel="nofollow" class="external text" href="https://www.itprotoday.com/compute-engines/death-alpha-nt">"The Death of Alpha on NT"</a>. ITPro Today. 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InfoWorld. 14 (47): 16.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=InfoWorld&rft.atitle=Intergraph+to+port+its+Unix-based+engineering+apps+to+Windows+NT&rft.volume=14&rft.issue=47&rft.pages=16&rft.date=1992-11-23&rft.aulast=Johnston&rft.aufirst=Stuart+J.&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DLlEEAAAAMBAJ%26pg%3DPA16&rfr_id=info%3Asid%2Fen.wikipedia.org%3AWindows+NT+3.1" class="Z3988"> </li> <li id="cite_note-IW22Nov1993_S66-58"><a href="#cite_ref-IW22Nov1993_S66_58-0">^</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFKentArmstrongNash1993" class="citation journal cs1">Kent, Les; Armstrong, James; Nash, Siobhan (November 22, 1993). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=ATsEAAAAMBAJ&pg=PA66">"32-bit desktop operating systems: Finding the right operating system to suit your needs"</a>. InfoWorld. 15 (47): 66–83.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=InfoWorld&rft.atitle=32-bit+desktop+operating+systems%3A+Finding+the+right+operating+system+to+suit+your+needs&rft.volume=15&rft.issue=47&rft.pages=66-83&rft.date=1993-11-22&rft.aulast=Kent&rft.aufirst=Les&rft.au=Armstrong%2C+James&rft.au=Nash%2C+Siobhan&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DATsEAAAAMBAJ%26pg%3DPA66&rfr_id=info%3Asid%2Fen.wikipedia.org%3AWindows+NT+3.1" class="Z3988"> </li> <li id="cite_note-cnet-xpreview-59"><a href="#cite_ref-cnet-xpreview_59-0">^</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://reviews.cnet.com/windows/microsoft-windows-xp-home/4505-3672_7-6534881.html">"Windows XP review"</a>. CNET. September 4, 2001. Retrieved May 24, 2013.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Windows+XP+review&rft.pub=CNET&rft.date=2001-09-04&rft_id=http%3A%2F%2Freviews.cnet.com%2Fwindows%2Fmicrosoft-windows-xp-home%2F4505-3672_7-6534881.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AWindows+NT+3.1" class="Z3988"> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2>[<a href="/w/index.php?title=Windows_NT_3.1&action=edit&section=12" title="Edit section: External links">edit</a>]</div> <ul><li><a rel="nofollow" class="external text" href="http://www.guidebookgallery.org/guis/windows/winnt31">Guidebook: Windows NT 3.1 Gallery</a> – Gallery of UI screenshots of Windows NT 3.1</li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist 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style="width:1%"><a href="/wiki/Windows_9x" title="Windows 9x">Windows 9x</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Windows_95" title="Windows 95">95</a></li> <li><a href="/wiki/Windows_98" title="Windows 98">98</a></li> <li><a href="/wiki/Windows_Me" title="Windows Me">Me</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Windows_NT" title="Windows NT">Windows NT</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Base releases</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a class="mw-selflink selflink">NT 3.1</a></li> <li><a href="/wiki/Windows_NT_3.5" title="Windows NT 3.5">NT 3.5</a></li> <li><a href="/wiki/Windows_NT_3.51" title="Windows NT 3.51">NT 3.51</a></li> <li><a href="/wiki/Windows_NT_4.0" title="Windows NT 4.0">NT 4.0</a></li> <li><a href="/wiki/Windows_2000" title="Windows 2000">2000</a></li> <li><a href="/wiki/Windows_XP" title="Windows XP">XP</a> <ul><li><a href="/wiki/Windows_XP_Professional_x64_Edition" title="Windows XP Professional x64 Edition">Pro x64</a></li> <li><a href="/wiki/Windows_XP_Media_Center_Edition" title="Windows XP Media Center Edition">Media Center</a></li></ul></li> <li><a href="/wiki/Windows_Vista" title="Windows Vista">Vista</a></li> <li><a href="/wiki/Windows_7" title="Windows 7">7</a></li> <li><a href="/wiki/Windows_8" title="Windows 8">8</a> / <a href="/wiki/Windows_8.1" title="Windows 8.1">8.1</a></li> <li><a href="/wiki/Windows_10" title="Windows 10">10</a></li> <li><a href="/wiki/Windows_11" title="Windows 11">11</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Windows_Server" title="Windows Server">Windows Server</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Windows_Server_2003" title="Windows Server 2003">Server 2003</a> <ul><li><a href="/wiki/Windows_Home_Server" title="Windows Home Server">Home Server</a></li></ul></li> <li><a href="/wiki/Windows_Server_2008" title="Windows Server 2008">Server 2008</a> <ul><li><a href="/wiki/Windows_Essential_Business_Server_2008" title="Windows Essential Business Server 2008">EBS 2008</a></li> <li><a href="/wiki/Windows_HPC_Server_2008" title="Windows HPC Server 2008">HPC Server 2008</a></li></ul></li> <li><a href="/wiki/Windows_Server_2008_R2" title="Windows Server 2008 R2">Server 2008 R2</a> <ul><li><a href="/wiki/Windows_Home_Server_2011" title="Windows Home Server 2011">Home Server 2011</a></li></ul></li> <li><a href="/wiki/Windows_Server_2012" title="Windows Server 2012">Server 2012</a></li> <li><a href="/wiki/Windows_Server_2012_R2" title="Windows Server 2012 R2">Server 2012 R2</a></li> <li><a href="/wiki/Windows_Server_2016" title="Windows Server 2016">Server 2016</a></li> <li><a href="/wiki/Windows_Server_2019" title="Windows Server 2019">Server 2019</a></li> <li><a href="/wiki/Windows_Server_2022" title="Windows Server 2022">Server 2022</a></li> <li><a href="/wiki/Windows_Server_2025" title="Windows Server 2025">Server 2025</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other releases</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Windows_Fundamentals_for_Legacy_PCs" title="Windows Fundamentals for Legacy PCs">Fundamentals for Legacy PCs</a></li> <li><a href="/wiki/Windows_RT" title="Windows RT">RT</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" 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style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Windows_CE_5.0" title="Windows CE 5.0">CE 5.0</a></li> <li><a href="/wiki/Windows_Embedded_CE_6.0" title="Windows Embedded CE 6.0">Embedded CE 6.0</a></li> <li><a href="/wiki/Windows_Embedded_Compact_7" title="Windows Embedded Compact 7">Embedded Compact 7</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Windows_Embedded_Automotive" title="Windows Embedded Automotive">Embedded Automotive</a></li> <li><a href="/wiki/Windows_Embedded_Industry" title="Windows Embedded Industry">Embedded Industry</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Windows_Mobile" title="Windows Mobile">Windows Mobile</a></th><td 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title="Windows 10X">10X</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li>Development <ul><li><a href="/wiki/Development_of_Windows_95" title="Development of Windows 95">95</a></li> <li><a href="/wiki/Development_of_Windows_XP" title="Development of Windows XP">XP</a></li> <li><a href="/wiki/Development_of_Windows_Vista" title="Development of Windows Vista">Vista</a></li></ul></li> <li>Editions <ul><li><a href="/wiki/Windows_XP_editions" title="Windows XP editions">XP</a></li> <li><a href="/wiki/Windows_Vista_editions" title="Windows Vista editions">Vista</a></li> <li><a href="/wiki/Windows_7_editions" title="Windows 7 editions">7</a></li> <li><a href="/wiki/Windows_8_editions" title="Windows 8 editions">8</a></li> <li><a href="/wiki/Windows_10_editions" title="Windows 10 editions">10</a></li> <li><a href="/wiki/Windows_11_editions" class="mw-redirect" title="Windows 11 editions">11</a></li></ul></li> <li>New features <ul><li><a href="/wiki/Features_new_to_Windows_XP" title="Features new to Windows XP">XP</a></li> <li><a href="/wiki/Features_new_to_Windows_Vista" title="Features new to Windows Vista">Vista</a></li> <li><a href="/wiki/Features_new_to_Windows_7" title="Features new to Windows 7">7</a></li> <li><a href="/wiki/Features_new_to_Windows_8" title="Features new to Windows 8">8</a></li> <li><a href="/wiki/Features_new_to_Windows_10" title="Features new to Windows 10">10</a></li> <li><a href="/wiki/Features_new_to_Windows_11" title="Features new to Windows 11">11</a></li></ul></li> <li>Removed features <ul><li><a href="/wiki/List_of_features_removed_in_Windows_XP" title="List of features removed in Windows XP">XP</a></li> <li><a href="/wiki/List_of_features_removed_in_Windows_Vista" title="List of features removed in Windows Vista">Vista</a></li> <li><a href="/wiki/List_of_features_removed_in_Windows_7" title="List of features removed in Windows 7">7</a></li> <li><a href="/wiki/List_of_features_removed_in_Windows_8" title="List of features removed in Windows 8">8</a></li> <li><a href="/wiki/List_of_features_removed_in_Windows_10" title="List of features removed in Windows 10">10</a></li> <li><a href="/wiki/List_of_features_removed_in_Windows_11" title="List of features removed in Windows 11">11</a></li></ul></li> <li><a href="/wiki/Microsoft_Windows_version_history" title="Microsoft Windows version history">Version history</a> <ul><li><a href="/wiki/Windows_Phone_version_history" title="Windows Phone version history">Phone</a></li> <li><a href="/wiki/Windows_10_version_history" title="Windows 10 version history">10</a></li> <li><a href="/wiki/Windows_10_Mobile_version_history" title="Windows 10 Mobile version history">10 Mobile</a></li> <li><a href="/wiki/Windows_11_version_history" title="Windows 11 version 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