| Codename
|
Preliminary name
|
Final name
|
Notes
|
| NT OS/2, OS/2 3.0, Portable OS/2, NTOS, Razzle
|
|
Windows NT 3.1
|
|
| 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 4.0 Embedded
|
|
| Windows NT 5.0
|
|
Windows 2000
|
Same codename as Windows 98. Its server counterpart is called Windows Server 2000.
|
| Asteroid
|
|
Cancelled SP2 release of Windows 2000
|
|
| 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 Whistler build 2202, Neptune and Project Odyssey. Named after Whistler, British Columbia, where design retreats were held.
|
| Odyssey
|
Windows 5.1, Windows NT 5.1
|
Windows XP
|
Ideas project, merged to Whistler.
|
| Sundown
|
|
Windows XP Professional x64 Edition
|
|
| Mira
|
|
Windows XP Tablet PC Edition
|
|
| Lonestar
|
|
Windows XP Tablet PC Edition 2005
|
|
| Triton
|
N/A
|
| Mantis
|
|
Windows XP Embedded
|
|
| Creekside
|
|
Windows XP Starter
|
|
| Trident
|
|
Windows XP Media Center Edition
|
|
| eHome
|
|
Windows Media CenteR
|
|
| 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, Windows 2002 Server, Windows .NET Server, Windows .NET Server 2003
|
|
Windows Server 2003
|
| 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
|
|
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 Vista
|
Named after the Longhorn Bar in the Whistler-Blackcomb resort; initially planned as an "interim release" between "Whistler" and "Blackcomb" (which is now "Vienna"). Reset in 2004 due to development issues.
|
| Cougar
|
Windows Small Business Server 2008
|
Cougar is a ski-run on Whistler Mountain.
|
| 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.
|
| Windows 7
|
Windows 7
|
"Windows 7" was the original project codename. It was decided that this must be kept.
|
| Server 7
|
|
Windows Server 2008 R2
|
In development. Planned "mid-size" (25-500 PC) edition of Longhorn Server.[1].
|
| Vail, Home Server 7
|
|
Windows Home Server 2010
|
|
|
|
Windows 8
|
|
| Server 8
|
|
Windows Server 2012
|
|
| Metro
|
|
Windows 8 Style UI
|
Renamed from Metro because of legal issues involving the German Metro company.
|
| Jupiter
|
|
Windows RT
|
Windows 8 application frameworj.
|
| 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
|
|
| Threshold
|
Windows 10
|
|
| Threshold 2
|
|
Windows 10 November Update
|
|
| Threshold Server
|
|
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 Server
|
Windows Server 2020, Windows Server version 2004
|
|
| 20H2, Magnanese (insider preview only)
|
|
Windows 10 20H2
|
|
| Server 20H2 (insider preview only)
|
|
Windows 10 20H2
|
|
| Iron
|
|
Windows 2020 Iron
|
|
| Server Iron
|
|
Windows Server Iron
|
|