Windows codenames

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Windows 3.1x/9x[edit | edit source]

Codename Preliminary name Final name Notes
Janus/Bombay Windows 3.1-11
Kato (Winball), Sparta (Jastro) Windows for Workgroups
Snowball (LB) Windows for Workgroups 3.11
Chicago Windows 4.0 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 OSR 2
Windows 96 (Cleveland/Nashville), Windows 97 (Memphis) Windows 4.1 Windows 98 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|Memphis, Egypt (or maybe Cairo, codename of Windows NT 4 - the map is too small to tell) to Memphis, Tennessee|Memphis, Tennessee. Still holding the Control key, drag another line from Memphis to Redmond, Washington;
  • a window (computing)|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 Millennium Windows Me Me stands for Millennium Edition

Windows NT family[edit | edit source]

Codename Preliminary name Final name Notes
NT OS/2/NT 3.2/AXP/June 93 OS/2 3.0 Windows NT 3.1
Daytona Windows NT 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 NT 3.51's kernel.
Wolfpack Microsoft Cluster Server
Hydra Terminal Services, Terminal Server hydra is a mythological monster with multiple head (anatomy)|heads.
Impala Windows NT 4.0 Embedded
NT 5.0 Windows NT 5.0 Windows 2000 A watershed in Windows naming:
  • first major Windows NT release whose client variant was named "Professional" instead of "Workstation";
  • first major Windows NT release without the "NT" designation in the trade name, which caused confusion when Windows ME was released. The original Windows line (Windows 9x) has since been dropped altogether, and Windows NT operating systems since then are simply referred to as "Windows".
Asteroid Windows 2000 Service Pack 1
Janus 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 .NET 2001 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.
Lone Star 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 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.
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 wireless networking, Virtual private networks|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 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).
Cougar Windows Small Business Server "Longhorn" In development. Cougar is a ski-run on Whistler Mountain.
Longhorn Windows Server 2008 In development. Planned server equivalent of Windows Vista to be released in 2008.
Centro In development. Planned "mid-size" (25-500 PC) edition of Longhorn Server.[2].
Blackcomb, Vienna Windows 7 Originally codenamed "Blackcomb" after the Whistler-Blackcomb resort. Renamed to "Vienna" in January 2006.
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.
Jupiter Windows 8
Metro Windows 8 Style UI Renamed from Metro because of a lawsuit with the German Metro company
Blue Windows 8.1
Threshold Windows 10