Windows codenames

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Windows 3.1x/9x[edit]

Codename Preliminary name Final name Notes
Janus/Bombay Windows 3.1, Windows 3.11, and Windows 3.2
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
Chicago 9x (95 Pre-Release) Windows 4.0 Windows 95 Same codename as Windows 7.1
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 OSR 2
Cleveland, Nashville Windows 4.1 Windows 96
Memphis Windows 4.2, Windows 97 Windows 98 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 codename of Windows NT 4 - 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 OEM/Corporate image cloning utility Dolly refers to Dolly the Sheep, the first sheep to be cloned.
Millennium Windows 4.9 Windows Me Me stands for Millennium Edition

Windows NT family[edit]

Codename Preliminary name Final name Notes
NT OS/2/NT 3.2/AXP/June 93 OS/2 3.0 Windows NT 3.1
Razzle Windows NT for Workgroups 3.1
Daytona Windows 3.5x
SUR (Shell Update Release)/Cairo, Cairo[1] Windows NT 4.0 Microsoft originally planned for NT 4.0 to be just a simple "Shell Update Release" to integrate the Windows 95 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
Memphis Windows 5 Windows NT 5.0, Windows 2000 Same codename as Windows 98
Memphis Server, Server 5 Windows NT 5.0 Server, 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
Odyssey N/A Ideas project, merged to Whistler.
Neptune N/A Ideas project, merged to Whistler.
Whistler Windows 5.1, Windows 101, Windows 2001, Windows .NET 2001, Windows NT XP Windows XP Merge of Whistler build 2202, Neptune and Project Odyssey. Named after Whistler, British Columbia, where design retreats were held.
Mantis Windows XP Embedded
eHome Windows XP Media Center Edition
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 2005 Update Rollup 2 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.
Lonestar Windows XP Tablet PC Edition 2005 A branch of the Windows XP Professional Service Pack 2 codebase, featuring enhancements specifically for Tablet PC hardware.
Whistler Server Windows XP Server, Windows .NET Server, Windows Server 2002 Windows Server 2003 One of many unrelated Microsoft projects of the time to carry a ".NET" designation. See: Microsoft .NET.
Bobcat Windows Small Business Server 2003 Bobcat is a ski-run on Whistler Mountain.
Whistler Server R2 Windows Server 2005 Windows Server 2003 R2
Eiger Windows Fundamentals for Legacy PCs 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 VPN-s 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 6 Windows Vista Went gold (RTM) on 8 of November 2006. Named after the Longhorn Bar in the Whistler-Blackcomb resort; initially planned as an "interim release" between "Whistler" and "Blackcomb" (which was "Vienna" and is now Windows 7).
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.
Cougar Windows Longhorn Small Business Server Windows Small Business Server 2008 Same codename as Windows for Workgroups 3.2. Cougar is a ski-run on Whistler Mountain.
Longhorn Server, Server 6 Windows Server 2007 Windows Server 2008 In development. Planned server equivalent of Windows Vista to be released in 2008.
Blackcomb, Vienna, Seven Windows 7 Originally codenamed "Blackcomb" after the Whistler-Blackcomb resort. Renamed to "Vienna" in January 2006.
Longhorn Server R2, Server 7 Windows Server 2009 Windows Server 2008 R2 In development. Planned "mid-size" (25-500 PC) edition of Longhorn Server.[2].
Chicago NT (Windows 7.1 Pre-Release) Windows 7.1 Same codename as Windows 95
Longhorn Server R3, Server 7.1 Windows Server 2010 Windows Server 2008 R3
Vail 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
Threshold Windows 9 Windows 10
Redstone Windows 10 (2016) Redstone is a mineral and item in Minecraft, a game product by Mojang and Microsoft bought it in 2015