Windows Blackhorn

Windows Blackhorn (Codename "Colorado") was an operating system released on July 27, 2004. It is similar to Windows Longhorn, but has features from Blackcomb, as the name suggests. It also has an Animated Bootscreen, like Windows Vista and 7.

History
Development was started in March 2002, under the codename Windows Colorado. As development went on, features from Longhorn were added to Colorado along with features from the never finished Blackcomb project. Eventually, in 2003, it was rebranded to Windows Blackhorn, since it was a combination of the two projects into one better, improved operating system. Blackhorn released in July 2004, about a month before the Longhorn development reset. About a month later, Windows Blackhorn Server 2004, the server version of the operating system, was released. Windows Blackhorn R2 was released in Mid-2005, and brought more features and improvements to Blackhorn R1. Support for R1 versions ended in May 2010 for Mainstream and May 2016 for Extended Support. Support for R2 versions ended in April 2013 for Mainstream and will end in April 2020 for Extended Support. A total of 4 service packs were released, 2 for R1, and 2 for R2 of Blackhorn.

Editions
Windows Blackhorn Home Edition

Windows Blackhorn Professional

Windows Blackhorn Professional 64-Bit

Windows Blackhorn Server 2004

Windows Blackhorn R2 Home Edition

Windows Blackhorn R2 Professional

Windows Blackhorn R2 Professional 64-Bit

Service Packs
Windows Blackhorn Service Pack 1 - October 5, 2004

Windows Blackhorn Service Pack 2 - March 11, 2005

Windows Blackhorn R2 Service Pack 1 - May 4, 2006

Windows Blackhorn R2 Service Pack 1a - August 18, 2007

Development Builds
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Trivia

 * The Non-GUI-Boot of the Blackhorn Bootscreen is similar to Vista's Bootscreen, except for the date and the design of the loading bar
 * The Non-GUI-Boot is normally disabled by default, but can be enabled by opening command prompt and typing "NONGUIBOOT Enable", which will enable it after a restart of the operating system