Windows codenames

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Windows 3.1x/9x

Codename Preliminary name Final name Notes
Janus Windows 3.1, Windows 3.11, and Windows 3.2 Same codename as Windows NT 5.0/2000 64-bit.
Kato (Winball), Sparta (Jastro) Windows for Workgroups 3.1
Snowball (LB) Windows for Workgroups 3.11
Cougar Windows for Workgroups 3.2 Same codename as Windows Small Business Server 2008
Project 9x Windows 4.0 Windows 94
Chicago Windows 95
O'Hare Internet Explorer, first shipped in Microsoft Plus! for Windows 95 O'Hare is the main airport for the city of Chicago.
Frosting Microsoft Plus! for Windows 95
Detroit Windows 95 Service Pack 2
Cleveland, Nashville Windows 4.1 Windows 96
ChiCairo Windows 97
Memphis Windows 4.2 Windows 98 Same codename as Windows 2000. The codename was the key to activating an easter egg in Windows 98:
  • open the "Date and Time" control panel;
  • go to the "Timezone" page;
  • hold the Control key and drag a line with the mouse cursor from Memphis, Egypt (or maybe Cairo - the map is too small to tell) to Memphis, Tennessee. Still holding the Control key, drag another line from Memphis to Redmond, Washington;
  • a window opens with the credits for Windows 98.
Dolly Windows 98 Second Edition Windows 99 Dolly refers to Dolly the Sheep, the first sheep to be cloned.
Millennium Windows 4.9, Windows 4.99, Windows 100 Windows Me Me stands for Millennium Edition

Windows NT family

Codename Preliminary name Final name Notes
AXP Windows NT 3.1
Razzle Windows NT for Workgroups 3.1, Windows NT for Workgroups 3.11
NT OS/2 OS/2 3.0 Windows NT 3.11
NT 3.2 Windows NT 3.2
Daytona Windows NT 3.5x Windows 3.5x
Cairo N/A Never released.
SUR (Shell Update Release), NT 96 Windows NT 4.0 Microsoft originally planned for NT 4.0 to be just a simple "Shell Update Release" to integrate the Windows 96 GUI with Windows 3.51's kernel.
Wolfpack Microsoft Cluster Server
Hydra Terminal Services, Terminal Server Windows NT 4.0 Terminal Server Terminal Server adds "multithreading" support to Windows (the ability to run multiple instances of the graphics subsystem), and the Lernaean Hydra is a mythological monster with multiple heads.
Impala Windows NT 4.1 Windows NT 4.0 Embedded
NT 5.0 Windows NT 5.0
Memphis Windows 5, Windows NT 4.9 Windows 2000 Same codename as Windows 98. Its server counterpart is called Windows Server 2000.
Asteroid Windows NT 5.0 Service Pack 1, Windows 2000 Service Pack 1
Janus Windows NT 5.0 64-bit, Windows 2000 64-bit Same codename as Windows 3.1
Neptune Windows 2001, Windows. NET 2001 N/A Ideas project, merged to Whistler.
Whistler N/A Windows Whistler Merge of Neptune. Named after Whistler, British Columbia, where design retreats were held.
Odyssey Windows 5.1, Windows NT 5.1 Windows XP
Sundown Windows XP Professional x64 Edition
Mira Windows XP Tablet PC Edition
Lonestar Windows XP Tablet PC Edition 2005
Triton N/A Windows 2003
Mantis Windows XP Embedded
Creekside Windows XP Starter
Trident Windows XP Media Center Edition
eHome Windows XP Media Center Edition 2002
Freestyle Windows XP Media Center Edition 2003 Name of a terrain rating system in the Whistler-Blackcomb resort.
Harmony Windows XP Media Center Edition 2004 Name of a ski lift and alpine bowl in Whistler, British Columbia.
Symphony Windows XP Media Center Edition 2005 Name of an alpine bowl in Whistler, British Columbia.
Emerald Windows XP Media Center Edition 2006 Name of a ski lift in Whistler, British Columbia.
Trainyard Windows XP Service Pack 1 Trainyard was an engineering package of driver updates to ship simultaneously with Windows XP Service Pack 1, the most major of which was support for USB 2.0 which was also ported backwards to Windows 2000.
Springboard Windows XP Service Pack 2 Name of a ski run on Blackcomb in Whistler, British Columbia.
Whistler Server N/A Windows Server 2000 R2
Odyssey Server Windows XP Server, Windows .NET Server Windows Server 2001 One of many unrelated Microsoft projects of the time to carry a ".NET" designation. See: Microsoft .NET.
Triton Server Windows 2003 Server Windows Server 2003
Bobcat Windows Small Business Server 2003 Bobcat is a ski-run on Whistler Mountain.
Longhorn Server Windows Server 2005 (post-reset) Windows Server 2004 (pre-reset), Windows Server 2003 R2 (post-reset)
Eiger Windows Fundamentals for Legacy PCs A low-end version of Windows XP that is intended to be a thin-client that works with older hardware. Available through the Microsoft Software Assurance program. The Eiger is a mountain in the Bernese Oberland in Switzerland. The Eiger is part of a trio of mountains, The Eiger, The Mönch and The Jungfrau.
Mönch Windows Mobile 6 Similar to Eiger, but supports Windows Mobile devices, Windows Image Acquisition, wireless networking, Virtual private networks (VPNs) and advanced IP (Internet Protocol) security. The Mönch is a mountain in the Bernese Oberland in Switzerland. The Mönch is part of a trio of mountains, The Eiger, The Mönch and The Jungfrau.
Longhorn Windows Longhorn Named after the Longhorn Bar in the Whistler-Blackcomb resort; initially planned as an "interim release" between "Whistler" and "Blackcomb" (which is now "Vienna").
Six Windows 6 Windows Vista Went gold (RTM) on 8 of November 2006.
Cougar Windows Vienna Small Business Server Windows Small Business Server 2008 Same codename as Windows for Workgroups 3.2. Cougar is a ski-run on Whistler Mountain.
Server 6, Vista Server Windows Server 2007
Home Server 6, Vista Home Server, Q, Quattro Windows Home Server Announced at CES 2007. Original project codename was "Quattro" because it was the leader of the project's 4th attempt at building a home server at Microsoft. Renamed to Q once the project moved out of incubation stage.
Vienna Server Windows Server 2007 R2 Windows Server 2008 In development. Planned server equivalent of Windows Vienna to be released in 2008.
Blackcomb, Vienna Windows Vienna Originally codenamed "Blackcomb" after the Whistler-Blackcomb resort. Renamed to "Vienna" in January 2006.
Seven Windows Vienna Service Pack 1 Windows 7
Server 7 Windows Server 2009 Windows Server 2008 R2 In development. Planned "mid-size" (25-500 PC) edition of Longhorn Server.[1].
Developer Preview (as a non-service pack), Vista 2 (as a service pack) Windows 7 Service Pack 1 Windows 7.1
Server 7.1 Windows Server 2011 Windows Server 2008 R3
Vail, Home Server 7 Windows Home Server 2010
Home Server 7.1 Windows Home Server 2010 R2 Windows Home Server 2011
Jupiter, Eight Windows 8
Server 8 Windows Server 2012
Metro Windows 8 Style UI Renamed from Metro because of a lawsuit with the German Metro company
Blue Windows 8.1
Server Blue, Server 8.1 Windows Server 2013 Windows Server 2012 R2
8.1 Update 1 Windows 8.1 Update 1 Windows 8.11
Server 8.11 Windows Server 2012 R3
Technical Preview Windows 9
Server 9 Windows Server 2012 R4 Windows Server 2014
Threshold Windows 9.1 Windows 10
Threshold 2 Windows 10 November Update
Threshold Server Windows Server 2015 Windows Server 2016
Redstone Windows 10 Anniversary Update Redstone is a mineral and item in Minecraft, a game product by Mojang and Microsoft bought it in 2015
Redstone 2 Windows 10 Creators Update
Redstone 3 Windows 10 Fall Creators Update
Redstone 3 Server Windows Server version 1709
Redstone 4 Windows 10 Spring Creators Update Windows 10 April 2018 Update
Redstone 4 Server Windows Server version 1803
Redstone 5 Windows 10 October 2018 Update
Redstone 5 Server Windows Server version 1809
19H1 Windows 10 19H1 Windows 10 May 2019 Update
Server 19H1 Windows Server 2016 R2 Windows Server 2019, Windows Server version 1903
19H2, Vanadium Windows 10 19H2 Windows 10 version 1909
Server 19H2, Server Vanadium Windows Server 19H2 Windows Server version 1909
20H1, Vibranium Windows 10 20H1, Windows 10 version 2004 Windows 2020
Server 20H1, Server Vibranium Windows Server 20H1, Windows 2020 Server Windows Server 2020, Windows Server version 2004
20H2 Windows 2020 20H2
Server 20H2 Windows Server 20H2
21H1 Windows 2021, Windows 11 Windows 2020 21H1
Server 21H1 Windows Server 2021, Windows Server 11 Windows Server 21H1
Santorini Windows 10X Windows 2020X
Manganese Windows 10 Manganese Windows 2020 Manganese
Server Manganese Windows Server Manganese
Iron Windows 2020 Iron
Server Iron Windows Server Iron