Microsoft Operating Systems Information.

Microsoft

• Xenix (licensed version of Unix; licensed to SCO in 1987)
• MSX-DOS (developed by MS Japan for the MSX 8-bit computer)
• MS-DOS (developed jointly with IBM, versions 1.0–6.22)
• Windows 1.0 (Windows 1 - Based on Visi-On) April 30, 1985
• Windows 2.0 (Windows 2) December 9, 1987
• Windows 3.0 (Windows 3 - Is the first version of Windows to make substantial commercial impact) May 22, 1990
• Windows 3.1x (Windows 3.1) March 18, 1992
• Windows 3.2 (Chinese-only release) November 19, 1992
• Windows for Workgroups 3.11 January 21, 1993
• Windows 95 (Windows 4) August 24, 1995
• Windows 98 (Windows 4.1) June 25, 1998
• Windows Millennium Edition (Windows Me - Windows 4.9) September 14, 2000
• Windows NT (Full 32-bit kernel, not dependent on MS-DOS)
• Windows NT 3.1 July 27, 1993
• Windows NT 3.5 September 21, 1994
• Windows NT 3.51 May 30, 1995
• Windows NT 4.0 July 31, 1996
• Windows 2000 (Windows NT 5.0), February 17, 2000
• Windows XP (Windows NT 5.1) October 25, 2001
• Windows Server 2003 (Windows NT 5.2) April 24, 2003
• Windows Fundamentals for Legacy PCs (based on Windows XP) July 8, 2006
• Windows Vista (Windows NT 6.0) January 31, 2007
• Windows Home Server (based on Windows Server 2003) February 28, 2008
• Windows Server 2008 (based on Windows Vista) February 28, 2008
• Windows 7 (Windows NT 6.1) October 22, 2009
• Windows Server 2008 R2 (based on Windows 7) October 22, 2009
• Windows Home Server 2011 (based on Windows Server 2008 R2) April 6, 2011
• Windows 8 Developers Preview (First downloadable release) September 14, 2011