Windows DOS By TheBlueRiolu_ Jun 1, 1980 Windows public beta Period: Nov 20, 1981 to Dec 31, 2001 Windows 1.0 Period: Dec 9, 1985 to Dec 31, 2001 Windows 2.0 Period: May 22, 1987 to Dec 31, 2001 Windows 3.0 Period: Apr 6, 1989 to Dec 31, 2001 Windows 3.1 Period: Aug 15, 1995 to Dec 31, 2002 Windows 95 internally Windows 4.0 Period: May 15, 1998 to Jul 11, 2004 Windows 98 internally Windows 4.1 Period: Jun 19, 2000 to Jul 13, 2008 Windows ME internally Windows 4.9 Period: Aug 24, 2001 to Apr 14, 2009 Windows XP internally Windows 5.1