Original: 8 April 2005 Windows XP Professional x64 Edition NT 5.2.3790 Current 8 July 2006 Windows Fundamentals for Legacy PCs NT 5.1.2600 Current 8 November 2006 (volume licensing)January 2007 (retail) Windows Vista NT 6.0.6002 Current.
Simplified: 8 November 2006 (volume licensing)January 2007 (retail) Windows Vista Current.