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Windows Longhorn (Longhorn)

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Windows Longhorn
Longhorndesktop
Screenshot of the Longhorn Desktop
Developer Microsoft
Source model Closed source / Shared source[1
Released to

manufacturing

September 7, 2004
General

availability

October 23, 2004
Latest release Service Pack 4 May 4, 2009
Platforms x86 and x64
Preceded by Windows XP (2001)
Succeeded by Windows Blackcomb (2011)
Support status
Mainstream support ended on 3 April 2011

Extended support until 9 April 2020

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