The Windows NT Timeline By miksimark26 Period: Jul 27, 1993 to Oct 29, 1994 The lifespan of Windows NT 3.1 Period: Sep 21, 1994 to Jun 21, 1995 The lifespan of Windows NT 3.5 Period: May 30, 1995 to Sep 19, 1996 The lifespan of Windows NT 3.51 Period: Jul 31, 1996 to Jul 26, 2001 THe lifespan of Windows NT 4.0 Period: Dec 15, 1999 to Sep 13, 2005 The Lifespan of Windows 2000 Period: Aug 25, 2001 to Apr 21, 2008 The lifespan of Windows XP (NT 6.x) Period: Nov 8, 2006 to May 26, 2009 The lifespan of Windows Vista Period: Jul 22, 2009 to Feb 22, 2011 The lifespan of Windows 7 Period: Aug 1, 2012 to Aug 1, 2012 The short lifespan of Windows 8 Period: Jul 27, 2013 to Apr 8, 2014 The lifespan of Windows 8.1 Period: Jul 15, 2015 to 2020 The lifespan of Windows 10