Microsoft Windows version release dates

Windows 1.0 - November 1985

Windows 2.0 - December 1987

Windows 3.0 - May 1990

Windows 3.1 - April 1992

Windows for Workgroups 3.11 - February 1994

WinNT 3.51 - June 1995

Windows 95 - August 1995

Windows NT4 - August 1996

Windows 95 OSR2 - October 1996

Windows 98 - June 1998

Windows 98SE- May 1999

Windows 2000- February 2000

Windows Me - July 2000

Windows XP - October 2001

Windows Server 2003 - 2003

Windows XP 64-bit - 2003

Windows Fundamentals for Legacy PCs - July 2006

Windows Vista (Business Customers) - November 2006

Windows Vista (Retail Customers) - January 2007

Windows 7 - October 2009