Editing List of Microsoft codenames (section)

==Operating systems==

===Windows 3.x and 9x===
{| class="sortable wikitable"
|-
!Codename Edge
!Preliminary name Edge
!Final name Edge
!Notes
!Ref
|-
|Janus
|{{N/a}}
|Windows & MS-DOS 5
|Combined bundle of [[Windows 3.1x|Windows 3.1]] and [[MS-DOS 5]]. [[Janus]] is a Roman god usually depicted with two faces, here symbolizing the previously separate Windows and MS-DOS products.
|<ref>Comes v Microsoft. [http://antitrust.slated.org/www.iowaconsumercase.org/TP011907.txt Transcript of Proceedings, Volume XXXIV] {{Webarchive|url=https://web.archive.org/web/20210113020844/http://antitrust.slated.org/www.iowaconsumercase.org/TP011907.txt |date=2021-01-13 }}</ref>
|-
|Jastro
|{{N/a}}
|Windows & MS-DOS 6
|Combined bundle of [[Windows 3.1x|Windows 3.1]] and [[MS-DOS 6]]. [[Portmanteau]] of Janus and Astro, the codename of MS-DOS 6.
|<ref>Comes v Microsoft. [http://antitrust.slated.org/www.iowaconsumercase.org/assets/attachments/2_6_07_Schulman_Deposition.pdf Deposition of Andrew Schulman, Volume 2]</ref>
|-
|[[Windows for Workgroups 3.1|Sparta, Winball]]
|Windows 3.1 Plus
|[[Windows for Workgroups 3.1]]
|Windows 3.1 ([[16-bit]]) with enhanced networking; designed to work particularly well as a client with the new [[Windows NT]].
|<ref>{{cite magazine |url=https://books.google.com/books?id=XlEEAAAAMBAJ&pg=PA39 |title=Windows to boost data sharing |magazine=[[InfoWorld]] |date=May 18, 1992 |first=Stuart |last=Johnston |volume=14 |issue=20 |page=39}}</ref><ref>{{cite journal |url=https://books.google.com/books?id=kREEAAAAMBAJ&pg=PA2 |title=Early users detail features of Windows pack |journal=[[Network World]] |date=April 27, 1992 |first=Margie |last=Wylie |volume=9 |issue=17 |page=2}}</ref>
|-
|[[Windows for Workgroups 3.11|Snowball]]
|{{N/a}}
|[[Windows for Workgroups 3.11]]
|An updated version of Windows for Workgroups 3.1, which introduces [[32-bit file access]] and network improvements. It also removes the Standard Mode, effectively dropping support for 16-bit x86 processors.
|<ref>{{cite journal |url=https://books.google.com/books?id=nREEAAAAMBAJ&pg=PA4 |title=Reworking Windows for Workgroups |journal=[[Network World]] |date=July 19, 1993 |first=Frederic |last=Paul |volume=10 |issue=29 |page=4}}</ref>
|-
|[[Windows 95|Chicago]]
|Windows 4.0, Windows 93, Windows 94
|[[Windows 95]]
|For codenames of some of the internal components of Windows 95, see "Jaguar", "Cougar", "Panther" and "Stimpy" under {{section link||OS components}}
|<ref name="Windows 95-related">{{cite magazine |url=https://books.google.com/books?id=nToEAAAAMBAJ&pg=PA30 |title=Delay of Windows 95 spells relief for many developers |magazine=[[InfoWorld]] |date=January 9, 1995 |first=Ilan |last=Greenberg |volume=17 |issue=2 |page=30}}</ref><ref>{{cite web
|url=http://iowa.gotthefacts.org/011607/5000/PX05516.pdf
|title=Chicago Feature Specification
|date=1992-09-30
|access-date=2010-03-02
|archive-date=2017-06-28
|archive-url=https://web.archive.org/web/20170628110747/http://iowa.gotthefacts.org/011607/5000/PX05516.pdf
|url-status=live
}}</ref>
|-
|Detroit
|{{N/A}}
|USB Supplement to Windows 95 OSR2
|Named after [[Detroit, Michigan]].  A writer for [[Maximum PC]] suggested that "Detroit" and other Windows 95-era names were answers to the question posed by Microsoft's "[[Where do you want to go today?]]" marketing campaign.
|<ref>{{cite web |url=http://www.maximumpc.com/article/news/microsoft_unveils_official_name_windows_7 |title=Microsoft Unveils the Official Name for "Windows 7" |first=Mark Edward |last=Soper |date=October 14, 2008 |access-date=2009-05-23 |work=Maximum PC |publisher=Future US |archive-date=2015-04-19 |archive-url=https://web.archive.org/web/20150419030040/http://www.maximumpc.com/article/news/microsoft_unveils_official_name_windows_7 |url-status=live }}</ref>
|-
|[[Windows Nashville|Nashville]]
|Windows 96
|{{Dropped}}
|Named after [[Nashville]]. Cancelled upgrade for Windows 95; sometimes referred to in the press as ''Windows 96''.  Codename was reused for [[Internet Explorer 4.0]] and [[Windows Desktop Update]] which incorporated many of the technologies planned for Nashville.
|<ref>Comes v. Microsoft. [http://antitrust.slated.org/www.iowaconsumercase.org/011607/3000/PX03208.pdf Plaintiff's Exhibit 3208] {{Webarchive|url=https://web.archive.org/web/20081204155711/http://antitrust.slated.org/www.iowaconsumercase.org/011607/3000/PX03208.pdf |date=2008-12-04 }}: "Desktop Operating Systems Mission Memo". Microsoft Confidential.</ref><ref>Comes v. Microsoft. [http://antitrust.slated.org/www.iowaconsumercase.org/010807/PLEX_5735.pdf Plaintiff's Exhibit 5735] {{Webarchive|url=https://web.archive.org/web/20080908072344/http://antitrust.slated.org/www.iowaconsumercase.org/010807/PLEX_5735.pdf |date=2008-09-08 }}. Microsoft Confidential (October 25, 1995).</ref>
|-
|[[Windows 98|Memphis]]
|Windows 97
|[[Windows 98]]
|{{N/A}}
|<ref>{{cite web |url = http://www.windowsitpro.com/article/news2/memphis-windows-98-.aspx |archive-url = https://archive.today/20120919025146/http://www.windowsitpro.com/article/news2/memphis-windows-98-.aspx |url-status = dead |archive-date = 19 September 2012 |title = Memphis: Windows 98? |work = Windows IT Pro |publisher = Penton Media, Inc. |date = 6 June 1997 |access-date = 16 December 2010 |first1 = Paul |last1 = Thurrott |author-link1 = Paul Thurrott }}</ref><ref>United States v. Microsoft Corporation. [https://www.justice.gov/sites/default/files/atr/legacy/2006/03/03/202.pdf Government Exhibit 202] {{Webarchive|url=https://web.archive.org/web/20220126212257/https://www.justice.gov/sites/default/files/atr/legacy/2006/03/03/202.pdf |date=2022-01-26 }}: "C. Wildfeuer message re 'Memphis IE 4 focus groups report'"</ref>
|-
|[[Windows Me|Millennium]]
|{{N/a}}
|[[Windows Me]]
|''ME'' stands for ''Millennium Edition''; Microsoft states that it is pronounced ''Me''.
|<ref>{{cite web |url=http://news.cnet.com/Microsoft-names-new-consumer-OS-Windows-Me/2100-1040_3-236499.html |title=Microsoft names new consumer OS: Windows Me |work=[[CNET.com]] |first=Stephanie |last=Miles |date=February 3, 2000 |access-date=December 18, 2010 |archive-date=June 17, 2011 |archive-url=https://web.archive.org/web/20110617100519/http://news.cnet.com/Microsoft-names-new-consumer-OS-Windows-Me/2100-1040_3-236499.html |url-status=live }}</ref>
|}

===Windows NT family===
{| class="sortable wikitable"
|+
|-
!Codename
!Preliminary name
!Final name
!Notes
!Ref
|-
|Razzle
|NT OS/2, Advanced Windows 
|[[Windows NT 3.1]]
|Is also the name of a [[Scripting language|script]] that sets up the Windows NT development environment. NT OS/2 reflected the first purpose of Windows NT to serve as the next version of [[OS/2]], before Microsoft and [[IBM]] split up. Microsoft used the NT OS/2 code to release Windows NT 3.1.
|<ref>{{cite web
|url=http://blogs.msdn.com/b/bwill/archive/2004/06/22/163020.aspx#163236
|title=How well do you know your Microsoft acronyms?
|date=June 22, 2004
|access-date=2015-07-21
|archive-date=2014-04-04
|archive-url=https://web.archive.org/web/20140404070850/http://blogs.msdn.com/b/bwill/archive/2004/06/22/163020.aspx#163236
|url-status=live
}}</ref><ref>{{cite web|last1=Chen|first1=Raymond|title=Random internal Windows terminology: IDW, Razzle, and their forgotten partners IDS and Dazzle|url=https://devblogs.microsoft.com/oldnewthing/20181224-00/?p=100545|website=The Old New Thing|publisher=[[Microsoft]]|date=24 December 2018|access-date=4 December 2020|archive-date=15 February 2022|archive-url=https://web.archive.org/web/20220215071732/https://devblogs.microsoft.com/oldnewthing/20181224-00/?p=100545|url-status=live}}</ref><ref>{{Cite magazine|last=Johnston|first=Stuart J.|date=18 February 1991|title='Advanced Windows' May Resolve OS/2 Dilemma|url=https://books.google.com/books?id=XVAEAAAAMBAJ&pg=PT4|magazine=[[InfoWorld]]|volume=13|issue=7|pages=5|access-date=5 July 2021|archive-date=9 July 2021|archive-url=https://web.archive.org/web/20210709190127/https://books.google.com/books?id=XVAEAAAAMBAJ&pg=PT4|url-status=live}}</ref><ref>{{Cite magazine|last=Johnson|first=Stuart J.|date=8 July 1991|title=Microsoft drops OS/2 2.0 API, revamps 32-bit Windows plans|url=https://books.google.com/books?id=iVAEAAAAMBAJ&pg=PA103|magazine=[[InfoWorld]]|volume=13|issue=27|pages=1, 103|access-date=18 November 2021|archive-date=9 March 2022|archive-url=https://web.archive.org/web/20220309141231/https://books.google.com/books?id=iVAEAAAAMBAJ&pg=PA103|url-status=live}}</ref>
|- Windows Abby Hatcher Me 10 Server 2019 [23]
|Daytona
|{{N/A}}
|[[Windows NT 3.5]]
| Named after the [[Daytona International Speedway]] in [[Daytona Beach, Florida]].
|<ref>{{cite book
 | title = Microsoft Windows Internals
 | edition = 4th
 | last1 = Russinovich
 | first1 = Mark
 | author-link = Mark Russinovich
 | first2 = David A.
 | last2 = Solomon
 | year = 2005
 | publisher = Microsoft Press
 | isbn = 0-7356-1917-4
 | quote = The first release of Windows NT was larger and slower than expected, so the next major push was a project called Daytona, named after the speedway in Florida.  The main goals for this release were to reduce the size of the system, increase the speed of the system, and, of course, to make it more reliable.
 | page = xx
 | url = https://archive.org/details/isbn_9780735619173
 }}</ref>
|-
|[[Cairo (operating system)|Cairo]]
|{{N/A}}
|{{Dropped}}
|A cancelled project that would have fulfilled Bill Gates' "Information at your fingertips" vision
|<ref>{{Cite web |url=http://www.microsoft.com/presspass/press/1996/jun96/dirserpr.mspx |title=Microsoft Demonstrates Next-Generation Directory Server |website=[[Microsoft]] |access-date=2007-11-22 |archive-date=2009-01-12 |archive-url=https://web.archive.org/web/20090112225210/http://www.microsoft.com/presspass/press/1996/jun96/dirserpr.mspx |url-status=live }}</ref>
|-
|Shell Update Release
|{{N/A}}
|[[Windows NT 4.0]]
|{{N/A}}
|
|-
|Wolfpack
|{{N/A}}
|[[Microsoft Cluster Server]]
|{{N/A}}
|<ref>{{cite web
|url=http://news.cnet.com/Scalability-Day-falls-short/2100-1001_3-279928.html
|title=Scalability Day falls short
|last=Davis
|first=Jim
|work=[[CNet]]
|publisher=[[CBS Interactive]]
|date=May 20, 1997
|access-date=2009-05-23
|archive-date=2012-10-24
|archive-url=https://web.archive.org/web/20121024174534/http://news.cnet.com/Scalability-Day-falls-short/2100-1001_3-279928.html
|url-status=live
}}</ref>
|-
|Janus
|{{N/A}}
|{{Dropped}}
|Codename for the proposed 64-bit edition of [[Windows 2000]], which was never released.
|<ref>{{Cite magazine |last=Thurrott |first=Paul |date=July 27, 1999 |title=64-bit Windows 2000 on track for mid-2000 |url=http://www.windowsitpro.com/article/news2/64-bit-windows-2000-on-track-for-mid-2000.aspx |url-status=dead |magazine=Windows IT Pro |archive-url=https://archive.today/20120529015759/http://www.windowsitpro.com/article/news2/64-bit-windows-2000-on-track-for-mid-2000.aspx |archive-date=May 29, 2012}}</ref><ref>{{Cite web |date=August 26, 1999 |title=Windows 2000 to Launch at Comdex, 64-Bit Janus in the Wings |url=http://findarticles.com/p/articles/mi_m0CGN/is_1999_August_26/ai_55572391 |url-status=dead |archive-url=https://web.archive.org/web/20100718055750/http://findarticles.com/p/articles/mi_m0CGN/is_1999_August_26/ai_55572391/ |archive-date=July 18, 2010 |access-date=November 13, 2011 |website=Findarticles.com}}</ref>
|-
|Impala
|{{N/A}}
|[[Windows NT 4.0 Embedded]]
|{{N/A}}
|<ref name="ntexpe">{{cite web
  | url=http://msdn.microsoft.com/en-us/library/aa459171.aspx
  | title=Getting to Know Windows NT Embedded and Windows XP Embedded
  | first=Jon
  | last=Fincher
  | work=Get Embedded
  | publisher=Microsoft
  | date=November 20, 2001
  | access-date=2009-05-23
  | archive-date=2009-04-21
  | archive-url=https://web.archive.org/web/20090421144800/http://msdn.microsoft.com/en-us/library/aa459171.aspx
  | url-status=live
}}</ref>
|-
|[[Windows Neptune|Neptune]]
|{{N/A}}
|{{Dropped}}
|Planned to be the first consumer-oriented release of Windows NT succeeding the [[Windows 9x]] series; merged with [[Windows Odyssey|Odyssey]] to form [[Windows Whistler|Whistler]].
|<ref>{{cite web |url=http://www.digibarn.com/collections/screenshots/XP%20Neptune%20Build%205111/index.htm |title=DigiBarn Screen Shots: Windows XP Neptune Build 5111 |work=Digibarn.com |publisher=Digital Barn Computer Museum |access-date=2013-06-15 |archive-date=2020-09-18 |archive-url=https://web.archive.org/web/20200918041438/http://www.digibarn.com/collections/screenshots/XP%20Neptune%20Build%205111/index.htm |url-status=live }}</ref>
|-
|[[Windows Neptune#Triton|Triton]]
|{{N/A}}
|{{Dropped}}
|A cancelled successor to "[[Windows Neptune|Neptune]]".
|<ref>{{Cite web |title=Windows Triton - BetaArchive Wiki |url=https://www.betaarchive.com/wiki/index.php/Windows_Triton |access-date=2023-01-07 |website=www.betaarchive.com |language=en-GB}}</ref>
|-
|Asteroid
|{{N/A}}
|[[Windows 2000]] Service Pack 1
|{{N/A}}
|<ref>{{Cite web |date=2012-05-29 |title=Windows 2000 service pack nearing release - ZDNet Asia News |url=https://archive.today/20120529015721/http://www.zdnetasia.com/news/hardware/0,39042972,13024785,00.htm |access-date=2024-09-14 |website=archive.ph}}</ref>
|-
|[[Windows Odyssey|Odyssey]]
|{{N/A}}
|{{Dropped}}
|Planned to be a successor to [[Windows 2000]]; merged with [[Windows Neptune|Neptune]] to form [[Windows Whistler|Whistler]].
|
|-
|[[Development of Windows XP#"Whistler"|Whistler]]
|Windows 2002
|[[Windows XP]]
|Named after [[Whistler Blackcomb]], where design retreats were held.
|
|-
|Mantis
|{{N/A}}
|[[Windows XP Embedded]]
| Named after the [[Mantis shrimp]].
|<ref name="ntexpe" />
|-
|Freestyle
|{{N/A}}
|[[Windows XP Media Center Edition]]
|{{N/A}}
|<ref>{{cite magazine |url=https://www.pcmag.com/article2/0,2817,654995,00.asp |title=Only HP Selling Media Center PCs—For Now |magazine=[[PC Magazine]] |first=Mary Jo |last=Foley |date=October 29, 2002 |access-date=September 3, 2017 |archive-date=March 9, 2022 |archive-url=https://web.archive.org/web/20220309141232/https://www.pcmag.com/archive/only-hp-selling-media-center-pcs151for-now-32982 |url-status=live }}</ref><ref>{{cite web |url=http://news.cnet.com/Microsoft-frees-up-Freestyle/2100-1044_3-979772.html |title=Microsoft frees up Freestyle |work=[[CNET.com]] |first=Joe |last=Wilcox |date=January 8, 2003 |access-date=December 18, 2010 |archive-date=August 18, 2011 |archive-url=https://web.archive.org/web/20110818193401/http://news.cnet.com/Microsoft-frees-up-Freestyle/2100-1044_3-979772.html |url-status=live }}</ref>
|-
|Harmony
|{{N/A}}
|[[Windows XP Media Center Edition]] 2004
|{{N/A}}
|<ref>{{cite magazine |url=https://www.pcmag.com/article2/0,2817,1304918,00.asp |title=Second-Generation Media Center Edition: Worth the Wait |magazine=[[PC Magazine]] |first=Bill |last=Howard |date=September 30, 2003 |access-date=September 3, 2017 |archive-date=April 14, 2016 |archive-url=https://web.archive.org/web/20160414121608/http://www.pcmag.com/article2/0,2817,1304918,00.asp |url-status=live }}</ref>
|-
|Symphony
|{{N/A}}
|[[Windows XP Media Center Edition]] 2005
|{{N/A}}
|<ref>{{cite magazine |url=http://www.pcadvisor.co.uk/news/index.cfm?newsid=4192 |title=Microsoft aims high with Media Center update |magazine=[[PC Advisor]] |publisher=[[IDG News Service]] |first=Joris |last=Evers |date=October 12, 2004}}</ref>
|-
|Slalom
|{{N/A}}
|{{Dropped}}
|Longhorn Media Center Edition. Scrapped in favor of including Windows Media Center in Home Premium and Ultimate editions instead of a dedicated Media Center edition.
|-
|Emerald
|{{N/A}}
|[[Windows XP Media Center Edition]] 2005 Update Rollup 2
|{{N/A}}
|<ref name="emerald">{{cite web |url=http://www.eweek.com/c/a/Desktops-and-Notebooks/Microsoft-Has-New-Mission-for-Media-Center/ |title=Microsoft Has New Mission for Media Center |work=[[eWeek]] |first=John G. |last=Spooner |date=October 11, 2005 |access-date=December 18, 2010 }}</ref>
|-
|Diamond
|{{N/A}}
|[[Windows Media Center]]
|Included with [[Windows Vista]].
|<ref name="emerald" />
|-
|Springboard
|{{N/A}}
|{{N/A}}
|Set of enhanced security features, included in [[Windows XP Service Pack 2]].
|<ref>{{cite magazine |url=http://www.windowsitpro.com/article/news2/windows-xp-sp2-to-be-springboard-to-longhorn.aspx |archive-url=https://wayback.archive-it.org/all/20170525045409/http://windowsitpro.com/windows-server/windows-xp-sp2-be-springboard-longhorn |url-status=dead |archive-date=May 25, 2017 |title=Windows XP SP2 to be 'Springboard' to Longhorn |magazine=Windows IT Pro |first=Paul |last=Thurrott |date=October 15, 2003 }}</ref>
|-
|Lonestar
|{{N/A}}
|[[Windows XP Tablet PC Edition 2005]]
|{{N/A}}
|<ref>{{cite web |url=http://news.cnet.com/Next-Microsoft-Tablet-PC-software-renamed/2110-1001_3-5197209.html |title=Next Microsoft Tablet PC software renamed |work=[[CNET.com]] |first=Ina |last=Fried |date=October 15, 2003 |access-date=December 18, 2010 |archive-date=October 26, 2012 |archive-url=https://web.archive.org/web/20121026110018/http://news.cnet.com/Next-Microsoft-Tablet-PC-software-renamed/2110-1001_3-5197209.html |url-status=live }}</ref>
|-
|Whistler Server
|Windows 2002 Server,<br />Windows .NET Server,<br />Windows .NET Server 2003
|[[Windows Server 2003]]
|{{N/A}}
|<ref>{{cite magazine |url=http://www.windowsitpro.com/article/windows-server-2003/microsoft-sets-windows-server-2003-release-date.aspx |archive-url=https://archive.today/20130209130255/http://www.windowsitpro.com/article/windows-server-2003/microsoft-sets-windows-server-2003-release-date.aspx |url-status=dead |archive-date=February 9, 2013 |title=Microsoft Sets Windows Server 2003 Release Date |magazine=Windows IT Pro |first=Paul |last=Thurrott |date=January 9, 2003 }}</ref><ref>{{cite news |url=https://www.theregister.co.uk/2001/05/01/whistler_server_confirmed_as_windows/ |title=Whistler Server confirmed as Windows 2002 |work=[[The Register]] |first=John |last=Lettice |date=May 1, 2001 |access-date=August 10, 2017 |archive-date=August 10, 2017 |archive-url=https://web.archive.org/web/20170810132553/https://www.theregister.co.uk/2001/05/01/whistler_server_confirmed_as_windows/ |url-status=live }}</ref>
|-
|Bobcat
|{{N/A}}
|Windows Small Business Server 2003
|Not to be confused with [[Microsoft Bob]].
|<ref>{{cite web |url=http://www.pcworld.com/article/102644/microsoft_shares_sharepoint_details.html |archive-url=https://archive.today/20120908081509/http://www.pcworld.com/article/102644/microsoft_shares_sharepoint_details.html |url-status=dead |archive-date=September 8, 2012 |title=Microsoft Shares Sharepoint Details |work=[[PC World]]  |first=Ed |last=Scannell |date=July 15, 2002 }}</ref>
|-
|Eiger, Mönch
|{{N/A}}
|[[Windows Fundamentals for Legacy PCs]]
|Mönch included additional features for use on mobile devices.
|<ref>{{cite web |url=http://www.bit-tech.net/news/bits/2006/07/13/microsoft_releases_fundamentals/1 |title=Microsoft releases Fundamentals for older PCs |work=[[bit-tech]] |first=Glen |last=Chivers |date=July 13, 2006 |access-date=December 19, 2010 |archive-date=April 5, 2016 |archive-url=https://web.archive.org/web/20160405091301/http://www.bit-tech.net/news/bits/2006/07/13/microsoft_releases_fundamentals/1 |url-status=live }}</ref><ref>{{cite web |url=http://www.computerworld.com/s/article/101214/Microsoft_preparing_Windows_XP_based_thin_clients |title=Microsoft preparing Windows XP-based thin clients |work=[[Computerworld]]  |first=Joris |last=Evers |date=April 24, 2005 |access-date=December 19, 2010 |archive-date=June 29, 2011 |archive-url=https://web.archive.org/web/20110629201747/http://www.computerworld.com/s/article/101214/Microsoft_preparing_Windows_XP_based_thin_clients |url-status=live }}</ref>
|-
|Longhorn
|{{N/A}}
|[[Windows Vista]]
|Named after the Longhorn Bar in the [[Whistler Blackcomb]] ski resort; initially planned as a "minor release" between "Whistler" and "Blackcomb" (see below)
|<ref>{{Cite news
 |url=http://www.microsoft.com/presspass/press/2005/jul05/07-22LHMA.mspx 
 |title=Media Alert: Microsoft Unveils Official Name for "Longhorn" and Sets Date for First Beta Targeted at Developers and IT Professionals 
 |work=Microsoft News Center 
 |publisher=Microsoft Corporation 
 |date=5 July 2005 
 |access-date=16 December 2010 
 |location=Redmond, Washington 
 |url-status=dead 
 |archive-url=https://web.archive.org/web/20101120150045/http://www.microsoft.com/presspass/press/2005/jul05/07-22LHMA.mspx 
 |archive-date=20 November 2010 
}}</ref><ref>{{Cite news
 |url = http://news.cnet.com/Longhorns-new-name-Windows-Vista/2100-1016_3-5799734.html
 |title = Longhorn's new name: Windows Vista
 |work = [[CNET News]]
 |publisher = CBS Interactive
 |date = 22 July 2005
 |first1 = Mike
 |last1 = Ricciuti
 |access-date = 16 December 2010
 |archive-date = 25 October 2012
 |archive-url = https://web.archive.org/web/20121025142506/http://news.cnet.com/Longhorns-new-name-Windows-Vista/2100-1016_3-5799734.html
 |url-status = live
 }}</ref><ref>{{Cite news
 |url = http://www.betanews.com/article/Longhorn-Gets-a-Name-Windows-Vista/1122002477
 |title = Longhorn Gets a Name: Windows Vista
 |work = Betanews
 |date = 22 July 2005
 |first1 = Ed
 |last1 = Oswald
 |first2 = Nate
 |last2 = Mook
 |access-date = 16 December 2010
 |archive-date = 21 December 2010
 |archive-url = https://web.archive.org/web/20101221081349/http://www.betanews.com/article/Longhorn-Gets-a-Name-Windows-Vista/1122002477
 |url-status = live
 }}</ref>
|-
|Blackcomb, Vienna
|{{N/a}}
|{{Dropped}}
|The purported successor to Whistler, and later, Longhorn. Named after [[Whistler Blackcomb]], where design retreats were held. Blackcomb was later renamed to [[Vienna]] in January 2006, named after the capital of [[Austria]]. Eventually cancelled due to [[scope creep]] and replaced with [[Windows 7]].
|<ref name=":1">{{Cite web|date=2019-07-22|title=What was the code name for Windows 7?|url=https://devblogs.microsoft.com/oldnewthing/20190722-00/?p=102724|access-date=2020-06-25|website=The Old New Thing|language=en-US|archive-date=2021-09-26|archive-url=https://web.archive.org/web/20210926093909/https://devblogs.microsoft.com/oldnewthing/20190722-00/?p=102724|url-status=live}}</ref><ref>{{cite web |url=http://betanews.com/2006/01/19/blackcomb-renamed-to-vienna/ |title='Blackcomb' Renamed to 'Vienna' |work=[[Betanews]] |date=January 19, 2006 |access-date=April 5, 2014 |archive-date=June 24, 2015 |archive-url=https://web.archive.org/web/20150624041641/http://betanews.com/2006/01/19/blackcomb-renamed-to-vienna/ |url-status=live }}</ref>
|-
|Q, Quattro
|{{N/A}}
|[[Windows Home Server]]
|{{N/A}}
|<ref>{{cite magazine |url=http://www.windowsitpro.com/article/news2/q-it-up-windows-home-server-hits-external-beta.aspx |archive-url=https://archive.today/20130209083810/http://www.windowsitpro.com/article/news2/q-it-up-windows-home-server-hits-external-beta.aspx |url-status=dead |archive-date=February 9, 2013 |title=Q It Up: Windows Home Server Hits External Beta |magazine=Windows IT Pro |first=Paul |last=Thurrott |date=February 13, 2007 }}</ref><ref>{{cite magazine |url=http://www.computerworld.com/s/article/9007499/CES_Gates_expands_Microsoft_s_digital_home_plan |title=CES: Gates expands Microsoft's digital home plan |journal=[[Computerworld]] |first=Elizabeth |last=Montalbano |date=January 8, 2007 |access-date=December 20, 2010 |archive-date=May 16, 2010 |archive-url=https://web.archive.org/web/20100516043457/http://www.computerworld.com/s/article/9007499/CES_Gates_expands_Microsoft_s_digital_home_plan |url-status=live }}</ref>
|-
|Vail
|{{N/A}}
|[[Windows Home Server 2011]]
|{{N/A}}
|<ref>{{cite magazine |url=https://www.pcmag.com/business/article/public-preview-of-next-version |title=Public Preview of Windows Home Server "Vail" is Here |magazine=[[PC Magazine]] |first=Samara |last=Lynn |date=April 27, 2010 |access-date=September 3, 2017 |archive-date=August 31, 2010 |archive-url=https://web.archive.org/web/20100831004208/http://www.pcmag.com/business/article/public-preview-of-next-version |url-status=dead }}</ref>
|-
|Longhorn Server
|{{N/A}}
|[[Windows Server 2008]]
|{{N/A}}
|<ref>{{cite web |url=https://abcnews.go.com/Technology/PCWorld/story?id=3675218 |title=Microsoft Begins Buildup to Windows Server 2008 Release |work=[[ABC News (United States)|ABC News]] |publisher=[[American Broadcasting Company]] |first=Eric |last=Lai |date=October 1, 2007 |access-date=June 28, 2020 |archive-date=March 3, 2016 |archive-url=https://web.archive.org/web/20160303165425/http://abcnews.go.com/Technology/PCWorld/story?id=3675218 |url-status=live }}</ref>
|-
|Cougar
|{{N/A}}
|Windows Small Business Server 2008
|{{N/A}}
|<ref name="cougarcentro">{{cite magazine |url=http://www.itjungle.com/two/two022708-story03.html |title='Centro' and 'Cougar' Become Windows Server Essentials |magazine=[[The Windows Observer]] |first=Alex |last=Woodie |volume=5 |issue=8 |date=February 27, 2008 |url-status=dead |archive-url=https://web.archive.org/web/20111212044145/http://www.itjungle.com/two/two022708-story03.html |archive-date=December 12, 2011 }}</ref>
|-
|Centro
|{{N/A}}
|[[Windows Essential Business Server]]
|Named after the Spanish translation of the word "center".
|<ref name="cougarcentro" />
|-
|Windows 7
|{{N/A}}
|[[Windows 7]]
|The number 7 comes from incrementing the internal version number of [[Windows Vista]] (6.0) by one. Often incorrectly referred to as Blackcomb or Vienna, while the codenames actually refer to an earlier [[Windows Vista|Vista]] successor project that was cancelled due to [[scope creep]].
|<ref name=":1" /><ref>{{cite web |url=http://betanews.com/2007/02/15/microsoft-not-discussing-windows-7-office-14/ |title=Microsoft Not Discussing Windows 7, Office 14 |work=[[Betanews]] |date=February 15, 2007 |access-date=April 5, 2014 |archive-date=April 7, 2014 |archive-url=https://web.archive.org/web/20140407072448/http://betanews.com/2007/02/15/microsoft-not-discussing-windows-7-office-14/ |url-status=live }}</ref><ref>{{cite web |url=http://www.upi.com/Business_News/2009/07/23/Microsoft-finalizes-Windows-7-code/UPI-87421248404771/ |title=Microsoft finalizes Windows 7 code |work=[[United Press International]] |date=July 23, 2009 |access-date=December 20, 2010 |archive-date=December 26, 2010 |archive-url=https://web.archive.org/web/20101226163239/http://www.upi.com/Business_News/2009/07/23/Microsoft-finalizes-Windows-7-code/UPI-87421248404771 |url-status=live }}</ref>
|-
|Windows Server 7
| {{N/A}}
| [[Windows Server 2008 R2]]
|{{N/A}}
|
|-
|Fiji
|[[Windows Media Center#Windows Vista|Windows Vista Media Center Feature Pack 2008]]
|Windows Media Center TV Pack 2008
|Named after the country of [[Fiji]].
|<ref>{{cite web |url=https://arstechnica.com/journals/microsoft.ars/2008/06/02/windows-fiji-screenshots-leak-final-name-revealed |title=Windows Fiji screenshots leak, final name revealed? |work=[[Ars Technica]] |first=Emil |last=Protalinski |date=June 2, 2008 |access-date=June 14, 2017 |archive-date=October 16, 2008 |archive-url=https://web.archive.org/web/20081016090927/http://arstechnica.com/journals/microsoft.ars/2008/06/02/windows-fiji-screenshots-leak-final-name-revealed |url-status=live }}</ref>
|-
|Cascades 
|Windows Essential Business Server "v2"
|Windows Essential Business Server 2008 R2 (cancelled)
|Originally intended as the successor of [[Windows Essential Business Server 2008]] but was cancelled "due to external factors".
|<ref>{{cite web
 |url = http://blogs.technet.com/essentialbusinessserver/archive/2010/04/07/our-technical-findings-while-developing-ebs-v2.aspx
 |title = Windows Essential Business Server Team Blog : Our Technical Findings While Developing EBS v2
 |work = blogs.technet.com
 |publisher = Windows Essential Business Server Team
 |date = 7 April 2010
 |access-date = 23 April 2010
 |archive-date = 23 April 2010
 |archive-url = https://web.archive.org/web/20100423125151/http://blogs.technet.com/essentialbusinessserver/archive/2010/04/07/our-technical-findings-while-developing-ebs-v2.aspx
 |url-status = live
 }}</ref>
|-
|Aurora
|{{N/A}}
|Windows Small Business Server 2011 Essentials
|{{N/A}}
|<ref>{{cite web
 |url = http://www.neowin.net/news/windows-small-business-server-code-name-quotauroraquot-revealed
 |title = Windows Small Business Server code name "Aurora" revealed
 |work = Neowin.net
 |first1 = Tom
 |last1 = Warren
 |date = 3 February 2010
 |access-date = 16 December 2010
 |archive-date = 6 February 2010
 |archive-url = https://web.archive.org/web/20100206211553/http://www.neowin.net/news/windows-small-business-server-code-name-quotauroraquot-revealed
 |url-status = live
 }}</ref>
|-
|Quebec
|{{N/A}}
|[[Windows Embedded|Windows Embedded Standard 7]]
|Named after the province of [[Quebec]]
|<ref>{{Cite news
 |url = http://www.microsoft.com/presspass/press/2009/sep09/09-01NextWindowsEmbeddedPR.mspx?rss_fdn=Press%20Releases
 |title = Microsoft Delivers Windows 7-Based Windows Embedded Standard 2011 Community Technology Preview
 |work = Microsoft News Center
 |publisher = Microsoft Corporation
 |location = Redmond, Washington
 |date = 9 September 2009
 |access-date = 16 December 2010
 |archive-date = 7 September 2009
 |archive-url = https://web.archive.org/web/20090907161402/http://www.microsoft.com/presspass/press/2009/sep09/09-01NextWindowsEmbeddedPR.mspx?rss_fdn=Press%20Releases
 |url-status = live
 }}</ref>
|-
|Windows 8
|{{N/A}}
|[[Windows 8]]
|Often incorrectly referred to as Jupiter, Midori and Chidori. Jupiter is the application framework used to create "immersive" apps for [[Windows 8]], and Midori was a separate, managed code operating system. (see below)
|<ref>{{Cite web |last=Center |first=Microsoft News |date=2011-06-01 |title=Previewing "Windows 8" |url=https://news.microsoft.com/2011/06/01/previewing-windows-8/ |access-date=2024-07-07 |website=Stories |language=en-US}}</ref><ref>{{Cite web |title=Microsoft Windows President Steven Sinofsky Introduces the New Look of Windows |url=https://allthingsd.com/20110601/up-next-at-d9-microsoft-windows-president-steven-sinofsky-live-at-d9/ |access-date=2024-07-04 |website=AllThingsD |language=en-US}}</ref><ref>{{Cite web |last=Protalinski |first=Emil |date=2009-11-23 |title=Microsoft targets 2012 for Windows 8 |url=https://arstechnica.com/information-technology/2009/11/microsoft-roadmap-says-windows-8-in-2012/ |access-date=2024-06-29 |website=Ars Technica |language=en-us}}</ref>
|-
| Windows Server "8"
| {{N/A}}
| [[Windows Server 2012]]
|{{N/A}}
|<ref name="ZDNet1">{{cite web | url=http://www.zdnet.com/blog/microsoft/windows-server-8-officially-dubbed-windows-server-2012/12475 | title=Windows Server "8" officially dubbed Windows Server 2012 | work=[[ZDNet]]  | access-date=17 April 2012 | first=Mary Jo | last=Foley | date=17 April 2012 | archive-date=19 November 2014 | archive-url=https://web.archive.org/web/20141119011441/http://www.zdnet.com/blog/microsoft/windows-server-8-officially-dubbed-windows-server-2012/12475 | url-status=dead }}</ref>
|-
| Blue
| {{N/A}}
| [[Windows 8.1]]
|{{N/A}}
|<ref name="blue">{{cite web | url=http://blogs.technet.com/b/microsoft_blog/archive/2013/03/26/looking-back-and-springing-ahead.aspx | title=Looking Back and Springing Ahead | work=The Official Microsoft Blog | publisher=[[Microsoft]] | access-date=Aug 17, 2013 | first=Frank X. | last=Shaw | date=26 March 2013 | archive-date=2 July 2013 | archive-url=https://web.archive.org/web/20130702224122/http://blogs.technet.com/b/microsoft_blog/archive/2013/03/26/looking-back-and-springing-ahead.aspx | url-status=live }}</ref>
|-
| Windows Server Blue
| {{N/A}}
| [[Windows Server 2012 R2]]
|{{N/A}}
|
|-
| Threshold
| Windows&nbsp;8.2{{citation needed|date=March 2024}}, Windows&nbsp;9{{citation needed|date=July 2024}}
| [[Windows 10]]<br>Windows 10 November Update
| Named after a location seen in ''[[Halo: Combat Evolved]]'', near which [[Halo (megastructure)#Installation 04|Installation 04]] orbits.
|<ref name="zdnet-threshold">{{cite web | url=https://www.zdnet.com/article/microsoft-codename-threshold-the-next-major-windows-wave-takes-shape/ | title=Microsoft codename 'Threshold': The next major Windows wave takes shape  | first=Mary Jo | website=[[ZDNet]] | date=December 2, 2013 | last=Foley | access-date=August 14, 2015 | archive-date=December 9, 2017 | archive-url=https://web.archive.org/web/20171209220704/http://www.zdnet.com/article/microsoft-codename-threshold-the-next-major-windows-wave-takes-shape/ | url-status=live }}</ref>
|-
| Redstone
| {{N/A}}
| [[Windows Server 2016]]<br>[[Windows 10]] Creators Update<br>[[Windows 10]] Fall Creators Update<br>[[Windows 10]] April 2018 Update<br>[[Windows Server 2019]]
| Named after a fictional mineral from ''[[Minecraft]]''.
|<ref name="next update, first details">{{cite web | url=http://www.neowin.net/news/windows-redstone-will-come-in-two-waves-june-and-october-2016 | title=Windows Redstone will come in two waves, June and October 2016 | work=Neowin blog | publisher=Neowin | access-date=Apr 8, 2015 | first=Brad | last=Sams | date=Apr 7, 2015 | archive-date=April 9, 2015 | archive-url=https://web.archive.org/web/20150409111752/http://www.neowin.net/news/windows-redstone-will-come-in-two-waves-june-and-october-2016 | url-status=live }}</ref><ref name="big Windows update">{{cite web | url=https://www.engadget.com/2015/04/08/windows-10-update-redstone/ | title=Next year's big Windows 10 update is codenamed 'Redstone' | work=Engadget | publisher=AOL | access-date=Apr 8, 2015 | first=Daniel | last=Cooper | date=Apr 8, 2015 | archive-date=April 11, 2015 | archive-url=https://web.archive.org/web/20150411002737/https://www.engadget.com/2015/04/08/windows-10-update-redstone/ | url-status=live }}</ref>
|-
| Santorini
| [[Windows 10X]]
| {{Dropped}}
| Named after an [[Santorini|island]] in [[Greece]]. Originally supposed to be a new OS to be released mid-late 2021, was eventually cancelled. Some of its features were integrated into [[Windows 11]] and other products.
|<ref>{{cite web |url=https://www.theverge.com/2019/10/4/20897175/windows-10x-microsoft-lite-core-os-wcos-santorini-aruba-oasis-codenames |title=Microsoft Windows 10X: what the heck is it? |last=Hollister |first=Sean |date=October 4, 2019 |website=The Verge |access-date=June 29, 2020 |archive-date=October 8, 2021 |archive-url=https://web.archive.org/web/20211008222809/https://www.theverge.com/2019/10/4/20897175/windows-10x-microsoft-lite-core-os-wcos-santorini-aruba-oasis-codenames |url-status=live }}</ref>
|-
| Sun Valley 
| {{n/a}}
| [[Windows 11]]
|Named after [[Sun Valley, Idaho]].
|<ref>{{Cite news |last=Warren |first=Tom |date=June 16, 2021 |title=Windows 11's default wallpapers are Microsoft's best yet |work=[[The Verge]] |url=https://www.theverge.com/2021/6/16/22536375/microsoft-windows-11-default-wallpaper |access-date=June 16, 2021 |archive-date=June 16, 2021 |archive-url=https://web.archive.org/web/20210616143030/https://www.theverge.com/2021/6/16/22536375/microsoft-windows-11-default-wallpaper |url-status=live }}</ref><ref>{{Cite news |last=Aufranc |first=Jean-Luc |date=June 16, 2021 |title=Windows 11 build leaked, Windows 10 support ending in 2025 |work=CNX Software |url=https://www.cnx-software.com/2021/06/16/windows-11-build-leaked-windows-10-support-ending-in-2025/ |access-date=June 16, 2021 |archive-date=June 16, 2021 |archive-url=https://web.archive.org/web/20210616143024/https://www.cnx-software.com/2021/06/16/windows-11-build-leaked-windows-10-support-ending-in-2025/ |url-status=live }}</ref><ref>{{Cite web|last=Parmar|first=Mayank|date=2021-06-09|title=Microsoft accidentally confirms Windows Sun Valley update|url=https://www.windowslatest.com/2021/06/09/microsoft-accidentally-confirms-windows-sun-valley-update/|access-date=2021-07-24|website=Windows Latest|language=en-US|archive-date=2021-07-24|archive-url=https://web.archive.org/web/20210724182155/https://www.windowslatest.com/2021/06/09/microsoft-accidentally-confirms-windows-sun-valley-update/|url-status=live}}</ref><ref>{{Citation|title=Watch Panos Panay, Chief Product Officer, Microsoft sending a special message to Windows Insiders| date=June 24, 2021 |url=https://www.youtube.com/watch?v=2BdbuXUcjw0 |archive-url=https://ghostarchive.org/varchive/youtube/20211222/2BdbuXUcjw0 |archive-date=2021-12-22 |url-status=live|language=en|access-date=2021-07-24}}{{cbignore}}</ref>
|-
| Hudson Valley
|{{N/A}}
|{{unknown}}
| A possibly-planned version of Windows scheduled to be released in 2025. Named after [[Hudson Valley|Hudson Valley, New York]]
| <ref>{{Cite web |author1=Zac Bowden |date=2023-03-28 |title=Microsoft plans major platform upgrades for "Windows 12" that will modernize the OS with AI, faster updates, and better security |url=https://www.windowscentral.com/software-apps/windows-11/microsoft-windows-corepc-modern-platform-hudson-valley-2024 |access-date=2023-05-09 |website=Windows Central |language=en}}</ref><ref>{{Cite web |title=Windows 12 will be a different, modular monster with faster updates, AI integrations, and more |url=https://www.techspot.com/news/98123-windows-12-different-modular-monster-faster-updates-ai.html |access-date=2023-05-09 |website=TechSpot |date=29 March 2023 |language=en-US}}</ref><ref>{{Cite web |author1=Alex Wawro |date=2023-03-28 |title='Windows 12' leak just teased powerful AI upgrades — here's what we know |url=https://www.tomsguide.com/news/windows-12-leak-just-teased-powerful-ai-upgrades-heres-what-we-know |access-date=2023-05-09 |website=Tom's Guide |language=en}}</ref>
|}

===Windows platform engineering milestones===
The following are code names used for internal development cycle [[Iterative and incremental development|iterations]] of the Windows core, although they are not necessarily the code names of any of the resulting releases. With some exceptions, the semester designations usually matches the Windows version number.

{| class="sortable wikitable"
|-
! Codename
! Semester
! Release
! Notes
! Ref
|-
| Titanium
| 19H1
| [[Windows 10]] May 2019 Update
| Named after the [[Titanium|chemical element]] in the periodic table.
|<ref name=":0">{{Cite web|last=Foley|first=Mary Jo|title=What comes after Windows 10 19H1? Vanadium|url=https://www.zdnet.com/article/what-comes-after-windows-10-19h1-vanadium/|access-date=2020-06-25|website=ZDNet|language=en|archive-date=2022-02-23|archive-url=https://web.archive.org/web/20220223081546/https://www.zdnet.com/article/what-comes-after-windows-10-19h1-vanadium/|url-status=live}}</ref><ref>{{cite web |last1=Hassan |first1=Mehedi |title=Windows 10's Next Major Updates Will Be Codenamed Vanadium, Vibranium |url=https://www.thurrott.com/windows/windows-10/190138/windows-10s-next-major-updates-will-be-codenamed-vanadium-vibranium |website=Thurrott |date=October 31, 2018 |publisher=BWW Media Group |access-date=13 June 2021 |quote=Windows 10’s next major update is codenamed 19H1. |archive-date=13 June 2021 |archive-url=https://web.archive.org/web/20210613205930/https://www.thurrott.com/windows/windows-10/190138/windows-10s-next-major-updates-will-be-codenamed-vanadium-vibranium |url-status=live }}</ref>
|-
| Vanadium
| 19H2
| [[Windows 10]] November 2019 Update
| Named after the [[Vanadium|chemical element]] in the periodic table.
|<ref name=":0"/><ref name="Future US, Inc">{{cite web |last1=Brown |first1=Matt |title=Next Windows 10 updates reportedly codenamed 'Vanadium' and 'Vibranium' |url=https://www.windowscentral.com/next-windows-10-updates-reportedly-codenamed-vanadium-and-vibranium |website=Windows Central |date=October 31, 2018  |access-date=13 June 2021 |archive-date=13 June 2021 |archive-url=https://web.archive.org/web/20210613205931/https://www.windowscentral.com/next-windows-10-updates-reportedly-codenamed-vanadium-and-vibranium |url-status=live }}</ref><ref>{{cite web |last1=Hassan |first1=Mehedi |title=Windows 10's Next Major Updates Will Be Codenamed Vanadium, Vibranium |url=https://www.thurrott.com/windows/windows-10/190138/windows-10s-next-major-updates-will-be-codenamed-vanadium-vibranium |website=Thurrott |date=October 31, 2018 |publisher=BWW Media Group |access-date=13 June 2021 |quote=This means the next Windows 10 update, previously codenamed 19H2, will be called Vanadium (comes after Titanium/19H1). |archive-date=13 June 2021 |archive-url=https://web.archive.org/web/20210613205930/https://www.thurrott.com/windows/windows-10/190138/windows-10s-next-major-updates-will-be-codenamed-vanadium-vibranium |url-status=live }}</ref>
|-
| Vibranium
| 20H1
| [[Windows 10]] May 2020 Update<br>[[Windows 10]] October 2020 Update<br>[[Windows 10]] May 2021 Update<br>[[Windows 10]] November 2021 Update<br>[[Windows 10]] 2022 Update
| Named after the fictional metal [[Vibranium]] in [[Marvel Comics]] as continuing the previous line of [[chemical element]]s with [[Chromium]] could have caused confusion with the [[Chromium (web browser)|web browser project]].
|<ref name=":0" /><ref name="Future US, Inc"/><ref>{{cite web |last1=Hassan |first1=Mehedi |title=Windows 10's Next Major Updates Will Be Codenamed Vanadium, Vibranium |url=https://www.thurrott.com/windows/windows-10/190138/windows-10s-next-major-updates-will-be-codenamed-vanadium-vibranium |website=Thurrott |date=October 31, 2018 |publisher=BWW Media Group |access-date=13 June 2021 |archive-date=13 June 2021 |archive-url=https://web.archive.org/web/20210613205930/https://www.thurrott.com/windows/windows-10/190138/windows-10s-next-major-updates-will-be-codenamed-vanadium-vibranium |url-status=live }}</ref>
|-
| Manganese
| 20H2
| {{N/A}}{{efn|name=insider}}
| Named after the [[Manganese|chemical element]] in the periodic table.
|<ref>{{Cite web|last=Tiwari|first=Aditya|date=2020-04-11|title=The Next Windows 10 Version Is Called "Manganese"|url=https://fossbytes.com/the-next-windows-10-version-is-called-manganese/|access-date=2020-06-25|website=Fossbytes|language=en-US|archive-date=2021-06-12|archive-url=https://web.archive.org/web/20210612203849/https://fossbytes.com/the-next-windows-10-version-is-called-manganese/|url-status=live}}</ref>
|-
| Iron
| 21H1
| [[Windows Server 2022]]{{efn|name=iron}}
| Named after the [[Iron|chemical element]] in the periodic table.
|<ref>{{Cite web|last=Shaikh|first=Rafia|date=2020-05-22|title=Windows 10 2021 Is Codenamed Iron (Fe) - Deleted Text Reveals|url=https://wccftech.com/windows-10-2021-is-codenamed-iron-fe-deleted-text-reveals/|access-date=2020-06-25|website=Wccftech|language=en-US|archive-date=2021-04-21|archive-url=https://web.archive.org/web/20210421140231/https://wccftech.com/windows-10-2021-is-codenamed-iron-fe-deleted-text-reveals/|url-status=live}}</ref>
|-
| Cobalt
| 21H2
| [[Windows 11]]
| Named after the [[Cobalt|chemical element]] in the periodic table.
|
|-
| Nickel
| 22H2
| [[Windows 11]] 2022 Update
|Named after the [[Nickel|chemical element]] in the periodic table. Originally planned to be the 22H1 semester, although that semester was ultimately skipped and Nickel shifted to 22H2, expanded to span the entire year.
|<ref>{{Cite web|last=Nayan|date=2021-06-21|title=Development of Windows 11 Summer'21 (co_release) & Fall'21 (co_refresh) releases explained in a collated timeline|url=https://thewincentral.com/windows-11-summer21-co_release-fall21-co_refresh-developments-explained-in-a-collated-timeline/|access-date=2021-08-17|website=WinCentral|language=en-US|archive-date=2021-08-17|archive-url=https://web.archive.org/web/20210817022518/https://thewincentral.com/windows-11-summer21-co_release-fall21-co_refresh-developments-explained-in-a-collated-timeline/|url-status=live}}</ref>
|-
| Copper
| 23H1
| {{N/A}}{{efn|name=insider}} <!-- builds from the RS_PRERELEASE branch are not matched to a specific Windows 11 release. -->
|Named after the [[Copper|chemical element]] in the periodic table.
|<ref>{{cite web|last1=Parmar|first1=Mayank|title=Windows 11 Build 22449 is now available with new loading animation|url=https://www.windowslatest.com/2021/09/03/windows-11-build-22449-is-now-available-with-new-loading-animation|website=Windows Latest|date=2 September 2021 |access-date=January 25, 2022|archive-date=January 25, 2022|archive-url=https://web.archive.org/web/20220125131232/https://www.windowslatest.com/2021/09/03/windows-11-build-22449-is-now-available-with-new-loading-animation/|url-status=live}}</ref>
|-
| Zinc{{citation needed|date=August 2023}} <!-- would make sense (follows previous names), but authoritative reference needed -->
| 23H2
| Windows Server, version 23H2
|Named after the [[Zinc|chemical element]] in the periodic table. 
|-
| Gallium {{citation needed|date=August 2023}} <!-- would make sense (follows previous names), but authoritative reference needed -->
| 24H1
| {{N/A}}{{efn|name=insider}} <!-- builds from the RS_PRERELEASE branch are not matched to a specific Windows 11 release. -->
|Named after the [[Gallium|chemical element]] in the periodic table.
|-
| Germanium {{citation needed|date=February 2024}} <!-- would make sense (follows previous names), but authoritative reference needed -->
| 24H2
| [[Windows 11]] 2024 Update<br/>[[Windows Server 2025]]
|Named after the [[Germanium|chemical element]] in the periodic table.
|-
| Dilithium {{citation needed|date=August 2024}} <!-- would make sense (follows previous names), but authoritative reference needed -->
| 25H1
| {{N/A}}{{efn|name=insider}}
|Named after the [[Dilithium (Star Trek)|fictional material]] from ''[[Star Trek]]''.
|-
| Selenium {{citation needed|date=April 2025}} <!-- would make sense (follows previous names), but authoritative reference needed -->
| 25H2
| {{N/A}}{{efn|name=insider}}
|Named after the [[Selenium|chemical element]] in the periodic table.
|}
{{notelist|refs=
{{efn|name=insider|Builds of these semesters were only released via the Windows Insider program.}}
{{efn|name=iron|Windows Server 2022 reports as version 21H2, although it is in fact based on the earlier Iron codebase.}}
}}

===Windows CE family===
{| class="sortable wikitable"
|-
!Codename
!Preliminary name
!Final name
!Ref
|-
|Pegasus, Alder || {{N/A}} || [[Windows CE 1.0]] || <ref name="boling">{{cite web |first=Douglas |last=Boling |url=http://download.microsoft.com/documents/australia/medc2006/Windows_CE6_Architecture_Boling.ppt |title=The Windows CE New Kernel |work=Mobile & Embedded DevCon 2006 |publisher=[[Microsoft]] |year=2006 |access-date=2006-08-08 |archive-date=2020-07-25 |archive-url=https://web.archive.org/web/20200725070150/https://download.microsoft.com/documents/australia/medc2006/Windows_CE6_Architecture_Boling.ppt |url-status=live }}</ref>
|-
|Birch || {{N/A}} || [[Windows CE 2.0]] || <ref name="boling"/>
|-
|Cedar || {{N/A}} || [[Windows CE 3.0]] || <ref name="boling"/>
|-
|Talisker || Windows CE .NET || [[Windows CE 4.0]] || <ref name="boling"/>
|-
|Jameson || {{N/A}} || [[Windows CE 4.1]] || <ref name=hall-2006 />
|-
|McKendric || {{N/A}} || [[Windows CE 4.2]] || <ref name=hall-2006 />
|-
|Macallan || {{N/A}} || [[Windows CE 5.0]] || <ref name="boling"/>
|-
|Yamazaki || Windows CE 6.0 || [[Windows Embedded CE 6.0]] || <ref name="boling"/><ref name=hall-2006>{{cite web|last=Hall|first=Mike|title=CE 6.0 - why the codename "Yamazaki" ?|url=http://blogs.msdn.com/b/mikehall/archive/2006/09/19/763146.aspx|work=Windows Embedded Blog|publisher=[[Microsoft]]|access-date=17 February 2014|date=20 September 2006|archive-date=18 September 2011|archive-url=https://web.archive.org/web/20110918183611/http://blogs.msdn.com/b/mikehall/archive/2006/09/19/763146.aspx|url-status=live}}</ref> 
|-
|Chelan || Windows Embedded CE 7 || [[Windows Embedded Compact 7]] ||<ref>{{cite web|last=Foley|first=Mary Jo|title=Microsoft 'Chelan': A new Windows Embedded platform takes shape|url=http://www.zdnet.com/blog/microsoft/microsoft-chelan-a-new-windows-embedded-platform-takes-shape/2781|work=[[ZDNet]]|publisher=[[CBS Interactive]]|access-date=17 February 2014|date=14 May 2009|archive-date=22 February 2014|archive-url=https://web.archive.org/web/20140222180414/http://www.zdnet.com/blog/microsoft/microsoft-chelan-a-new-windows-embedded-platform-takes-shape/2781|url-status=dead}}</ref> 
|}

===Windows Mobile===
{| class="sortable wikitable"
|-
!Codename
!Preliminary name
!Final name
!Ref
|-
|Rapier
|{{N/A}}
|[[Pocket PC 2000]]
|<ref name="ChrisDeHerrera1">{{cite web |title=Windows CE / Windows Mobile Versions |url=http://www.pocketpcfaq.com/wce/versions.htm |website=pocketpcfaq.com |publisher=[[WP:SPS|Self-published]] |first=Chris |last=De Herrera |access-date=2018-01-18 |archive-date=2019-09-04 |archive-url=https://web.archive.org/web/20190904061634/http://www.pocketpcfaq.com/wce/versions.htm |url-status=live }}</ref>
|-
|Merlin
|{{N/A}}
|[[Pocket PC 2002]]
|<ref name="ChrisDeHerrera1"/>
|-
|Ozone
|{{N/A}}
|[[Windows Mobile 2003]]
|<ref name="ChrisDeHerrera1"/>
|-
|Magneto
|{{N/A}}
|[[Windows Mobile 5]]
|<ref name="ChrisDeHerrera1"/>
|-
|Crossbow
|{{N/A}}
|[[Windows Mobile 6]]
|<ref name="ChrisDeHerrera1"/>
|-
|6 on 6
|{{N/A}}
|[[Windows Mobile 6.1|Windows Mobile 6.1.4]]
|<ref name="ChrisDeHerrera1"/>
|-
|Titanium
|{{N/A}}
|[[Windows Mobile 6.5]]
|<ref name="ChrisDeHerrera1"/>
|-
|Maldives
|Windows Mobile 7
|[[Windows Phone 7]]
|<ref name="ChrisDeHerrera1"/>
|}

=== Windows Phone ===
{| class="sortable wikitable"
|-
!Codename
!Preliminary name
!Final name
!Ref
|-
|Photon
|Windows Mobile 7 Series
|[[Windows Phone 7]]
|<ref>{{cite web|last1=Rojas|first1=Peter|title=Photon, the next version of Windows Mobile|url=https://www.engadget.com/2005/12/08/photon-the-next-version-of-windows-mobile/|website=[[Engadget]]|publisher=[[Aol]]|date=8 December 2005|access-date=3 September 2017|archive-date=28 January 2018|archive-url=https://web.archive.org/web/20180128190559/https://www.engadget.com/2005/12/08/photon-the-next-version-of-windows-mobile/|url-status=live}}</ref><ref name="Source for preliminary name">{{cite web|title=Mobile World Congress 2010 – day one overview|url=http://www.techcentral.co.za/mobile-world-congress-2010-day-one-overview/12826/|website=[[TechCentral]]|publisher=NewsCentral Media|date=15 February 2010|access-date=26 April 2015|archive-date=5 December 2014|archive-url=https://web.archive.org/web/20141205065622/http://www.techcentral.co.za/mobile-world-congress-2010-day-one-overview/12826/|url-status=live}}</ref>
|-
|Mango
| {{N/A}}
|[[Windows Phone 7.5]]
|<ref>{{cite web |url=https://www.theverge.com/2011/10/24/2509332/windows-phone-75-mango-review |title=Windows Phone 7.5 'Mango' release details and updated review |work=[[The Verge]] |publisher=[[Vox Media]] |date=September 27, 2011 |access-date=August 22, 2013 |first=Chris |last=Ziegler |archive-date=January 29, 2018 |archive-url=https://web.archive.org/web/20180129004335/https://www.theverge.com/2011/10/24/2509332/windows-phone-75-mango-review |url-status=live }}</ref><ref name="Codename tracker" />
|-
|Apollo
| {{N/A}}
|[[Windows Phone 8]]
|<ref name="Codename tracker" />
|-
|Blue
| {{N/A}}
|[[Windows Phone 8.1]]
|<ref name="zdnet-threshold" />
|-
|Threshold
| {{N/A}}
|[[Windows 10 Mobile]]
|<ref name=zdnet-threshold />
|}

===Others===
{| class="sortable wikitable"
|-
!Codename
!Preliminary name
!Final name
!Notes
!Ref
|-
|[[Singularity (operating system)|Singularity]]
|{{N/A}}
|{{N/A}}
|Experimental operating system based on the [[Microsoft .NET]] platform, using software-based [[type safety]] as a replacement for hardware-based [[memory protection]]. Evolved into [[Midori (operating system)|Midori]].
|<ref>{{Cite web |url=http://research.microsoft.com/os/singularity/ |title=Microsoft Research Singularity Project |access-date=2005-12-01 |archive-date=2005-11-05 |archive-url=https://web.archive.org/web/20051105024937/http://research.microsoft.com/os/singularity/ |url-status=live }}</ref>
|-
| [[Midori (operating system)|Midori]]
| {{N/A}}
| {{N/A}}
| A [[managed code]] [[operating system]] being developed by Microsoft with joint effort of [[Microsoft Research]].
| <ref>{{cite web|last1=Foley|first1=Mary Jo|title=Goodbye, XP. Hello, Midori|url=https://www.zdnet.com/article/goodbye-xp-hello-midori/|website=[[ZDNet]]|publisher=[[CBS Interactive]]|date=30 June 2008|access-date=27 January 2015|archive-date=14 June 2021|archive-url=https://web.archive.org/web/20210614194126/https://www.zdnet.com/article/goodbye-xp-hello-midori/|url-status=live}}</ref><ref>{{cite web|last1=Oiaga|first1=Marius|title=Life After Windows - Microsoft Midori Operating System|url=http://archive.news.softpedia.com/news/Life-After-Windows-Microsoft-Midori-Operating-System-88910.shtml|website=[[Softpedia]]|publisher=SoftNews|date=30 June 2008|access-date=27 January 2015|archive-url=https://web.archive.org/web/20141203092354/http://archive.news.softpedia.com/news/Life-After-Windows-Microsoft-Midori-Operating-System-88910.shtml|archive-date=3 December 2014|url-status=dead}}</ref>
|-
|Red Dog
|Windows Cloud
|[[Microsoft Azure|Azure]]
|Microsoft [[Cloud computing|cloud services]] platform
|<ref name="guide for the perplexed" />
|-
|Tahiti
|{{N/A}}
|{{N/A}}
|Supposedly a family of multi-core technologies including an operating system, applications and development tools designed to make better use of today's multi-core CPUs. [[Midori (operating system)|Midori]] may be a part of this suite of new Microsoft technologies.
|<ref name="Tahiti-manycore">{{Cite news
 |url = https://www.zdnet.com/article/tahiti-microsofts-ultimate-many-core-destination/
 |title = Tahiti: Microsoft's ultimate many-core destination
 |work = [[ZDNet]]
 |publisher = [[CBS Interactive]]
 |date = 15 July 2008
 |access-date = 22 December 2010
 |first = Mary Jo
 |last = Foley
 |archive-date = 9 March 2022
 |archive-url = https://web.archive.org/web/20220309141233/https://www.zdnet.com/article/tahiti-microsofts-ultimate-many-core-destination/
 |url-status = live
 }}</ref>
|-
|Tokyo
|Azure AD Cloud App Discovery
|Cloud App Discovery
|Azure-based data-directory service designed to help connect the right people to the right data.
|<ref name=tokyo1>{{cite web
 |url=https://www.thurrott.com/podcasts/4202/windows-weekly-418-the-stephen-elop-signature-edition
 |first=Mary Jo
 |last=Foley
 |title=Codename pick of the week: Project Tokyo
 |date=18 June 2015
 |publisher=[[TWiT]]
 |access-date=2016-11-16
 |archive-date=2018-08-28
 |archive-url=https://web.archive.org/web/20180828170117/https://www.thurrott.com/podcasts/4202/windows-weekly-418-the-stephen-elop-signature-edition
 |url-status=live
 }}</ref>
|-
|Zurich
|{{N/A}}
|.NET Services
|Part of [[Microsoft Azure]], Microsoft's [[cloud computing]] platform, that focuses on extended software development based on [[.NET Framework]] to the cloud.
|<ref name="guide for the perplexed">{{cite web|last1=Foley|first1=Mary Jo|title=How many people does it take to fill Bill Gates' shoes?|url=https://www.zdnet.com/article/how-many-people-does-it-take-to-fill-bill-gates-shoes/|website=[[ZDNet]]|publisher=[[CBS Interactive]]|date=23 June 2008|access-date=27 January 2015|archive-date=20 January 2021|archive-url=https://web.archive.org/web/20210120051722/https://www.zdnet.com/article/how-many-people-does-it-take-to-fill-bill-gates-shoes/|url-status=live}}</ref><ref>{{cite web|last1=Foley|first1=Mary Jo|title=Ozzie foreshadows 'Zurich,' Microsoft's elastic cloud|url=https://www.zdnet.com/finance/ozzie-foreshadows-zurich-microsofts-elastic-cloud/|website=[[ZDNet]]|publisher=[[CBS Interactive]]|date=24 July 2008|access-date=27 January 2015|archive-date=6 March 2021|archive-url=https://web.archive.org/web/20210306152156/https://www.zdnet.com/article/ozzie-foreshadows-zurich-microsofts-elastic-cloud/|url-status=live}}</ref><ref>{{cite web|last1=Foley|first1=Mary Jo|title=Microsoft's Azure cloud platform: A guide for the perplexed|url=https://www.zdnet.com/article/microsofts-azure-cloud-platform-a-guide-for-the-perplexed/|website=[[ZDNet]]|publisher=[[CBS Interactive]]|date=27 October 2008|access-date=27 January 2015|archive-date=25 February 2021|archive-url=https://web.archive.org/web/20210225085919/https://www.zdnet.com/article/microsofts-azure-cloud-platform-a-guide-for-the-perplexed/|url-status=live}}</ref>
|}