The Windows NT Timeline

The lifespan of Windows NT 3.1

Period: Jul 27, 1993 to Oct 29, 1994

The lifespan of Windows NT 3.5

Period: Sep 21, 1994 to Jun 21, 1995

The lifespan of Windows NT 3.51

Period: May 30, 1995 to Sep 19, 1996

THe lifespan of Windows NT 4.0

Period: Jul 31, 1996 to Jul 26, 2001

The Lifespan of Windows 2000

Period: Dec 15, 1999 to Sep 13, 2005

The lifespan of Windows XP (NT 6.x)

Period: Aug 25, 2001 to Apr 21, 2008

The lifespan of Windows Vista

Period: Nov 8, 2006 to May 26, 2009

The lifespan of Windows 7

Period: Jul 22, 2009 to Feb 22, 2011

The short lifespan of Windows 8

Period: Aug 1, 2012 to Aug 1, 2012

The lifespan of Windows 8.1

Period: Jul 27, 2013 to Apr 8, 2014

The lifespan of Windows 10

Period: Jul 15, 2015 to 2020