Windows codenames

=== Windows 3.1x/9x ===
Codename 	Preliminary name	Final name 	Notes
Kato (Winball), Sparta (Jastro)	 	Windows for Workgroups 3.1 	
Snowball (LB) 	 	Windows for Workgroups 3.11 	
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 OEM Service Release 2 	
Nashville 	 	Internet Explorer 4 	Cancelled Windows version
Memphis 	 	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 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.
Millennium 	 	Windows Me 	Me stands for Millennium Edition
=== Windows NT family ===
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 3.5 	
Cairo 	 	N/A 	Never released.
SUR (Shell Update Release) 	 	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 4.0 Embedded 	
Memphis NT 	Windows NT 5.0 	Windows 2000 	
Asteroid 	 	Windows 2000 Service Pack 1 	
Janus 	 	N/A 	Planned 64-bit variant of Windows 2000.
Neptune 	 	N/A 	Ideas project, merged to Whistler.
Whistler 	 	Windows XP 	Merge of Neptune and Odyssey. Named after Whistler, British Columbia, where design retreats were held.
Odyssey 	 	N/A 	Ideas project, merged to Whistler.
Anvil 	 	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 2002 	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	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 	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.
Crossbow 	 	Windows Mobile 6.0 	
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.
Windows Server 7 	 	Windows Server 2008 R2 	In development. Planned "mid-size" (25-500 PC) edition of Longhorn Server..
Vail 	 	Windows Home Server 2011 	
Windows 8 	 	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 framework.
Blue 	 	Windows 8.1 	
Server Blue 	 	Windows Server 2012 R2 	
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 2019, Windows Server version 1809 	
19H1 	Windows 10 19H1 	Windows 10 May 2019 Update 	
Server 19H1 	 	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 	
Server 20H1, Server Vibranium 	Windows Server 20H1 	Windows Server version 2004 	
20H2, Magnanese (insider preview only) 	 	Windows 10 20H2 	
Server 20H2 (insider preview only) 	 	Windows Server 20H2 	
Iron 	 	Windows 10 Iron 	
Server Iron 	 	Windows Server Iron 	
Category:Technology