sistemas operativos mas importantes By ElMarcoss Nov 20, 1985 Dows 1.0 1987 Dows 2.0 May 22, 1990 Dows 3.0 Aug 24, 1995 Windows 95 Jun 25, 1998 Windows 98 Mar 29, 1999 Windows 2000 Oct 25, 2001 Windows XP Jan 30, 2007 Windows Vista Oct 25, 2009 Windows 7 Oct 26, 2012 Windows 8