| 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
|
|