Microsoft Windows history

See the codename definition for a listing of Microsoft codenames.
MS-DOS history.
Year	Event
1983	Bill Gates announced Microsoft Windows on November 10, 1983.
1985	Microsoft Windows 1.0 was introduced on November 20, 1985, and was initially sold for $100.00.
1987	Microsoft Windows 2.0 was released on December 9, 1987, and was initially sold for $100.00.
1987	Microsoft Windows/386 or Windows 386 was introduced on December 9, 1987, and was initially sold for $100.00.
1988	Microsoft Windows/286 or Windows 286 is introduced in June 1988, and is initially sold for $100.00.
1990	Microsoft Windows 3.0 was released on May, 22 1990. Microsoft Windows 3.0 full version was priced at $149.95 and the upgrade version was priced at $79.95.
1991	Following its decision not to develop operating systems cooperatively with IBM, Microsoft changes the name of OS/2 to Windows NT.
1991	Microsoft Windows 3.0 or Windows 3.0a with multimedia was released in October 1991.
1992	Microsoft Windows 3.1 was released in April 1992 and sells more than one million copies in the first two months of its release.
1992	Microsoft Windows for Workgroups 3.1 was released in October 1992.
1993	Microsoft Windows NT 3.1 was released on July 27, 1993.
1993	Microsoft Windows 3.11, an update to Windows 3.1 was released on December 31, 1993.
1993	The number of licensed users of Microsoft Windows now totals more than 25 million.
1994	Microsoft Windows for Workgroups 3.11 was released in February 1994.
1994	Microsoft Windows NT 3.5 was released on September 21, 1994.
1995	Microsoft Windows NT 3.51 was released on May 30, 1995.
1995	Microsoft Windows 95 was released on August 24, 1995, and sold more than one million copies within four days.
1995	Microsoft Windows 95 Service Pack 1 (4.00.950A) was released on February 14, 1996.
1996	Microsoft Windows NT 4.0 was released on July 29, 1996.
1996	Microsoft Windows 95 (4.00.950B) aka OSR2 with FAT32 and MMX support was released on August 24, 1996.
1996	Microsoft Windows CE 1.0 was released in November 1996.
1997	Microsoft Windows CE 2.0 was released in November 1997.
1997	Microsoft Windows 95 (4.00.950C) aka OSR2.5 was released on November 26, 1997.
1998	Microsoft Windows 98 was released in June 1998.
1998	Microsoft Windows CE 2.1 was released in July 1998.
1998	In October 1998, Microsoft announced that future releases of Windows NT would no longer have the initials of NT and that the next edition would be Windows 2000.
1999	Microsoft Windows 98 SE (Second Edition) was released on May 5, 1999.
1999	Microsoft Windows CE 3.0 was released in 1999.
2000	On January 4th, 2000, at CES, Bill Gates announced the new version of Windows CE will be called Pocket PC.
2000	Microsoft Windows 2000 was released on February 17, 2000.
2000	Microsoft Windows ME (Millennium) was released on June 19, 2000.
2001	Microsoft Windows XP was released on October 25, 2001.
2001	Microsoft Windows XP 64-Bit edition (version 2002) for Itanium systems was released on March 28, 2003.
2003	Microsoft Windows Server 2003 was released on March 28, 2003.
2003	Microsoft Windows XP 64-Bit edition (version 2003) for Itanium 2 systems was released on March 28, 2003.
2003	Microsoft Windows XP Media Center edition 2003 was released on December 18, 2003.
2004	Microsoft Windows XP Media Center edition 2005 was released on October 12, 2004.
2005	Microsoft Windows XP Professional x64 edition was released on April 24, 2005.
2005	Microsoft announced its next operating system, code-named "Longhorn" would be named Windows Vista on July 23, 2005.
2006	Microsoft released Microsoft Windows Vista to corporations on November 30, 2006.
2007	Microsoft released Microsoft Windows Vista and Office 2007 to the general public on January 30, 2007.
2008	Microsoft released Microsoft Windows Server 2008 to the public on February 27, 2008.
2009	Microsoft released Windows 7 on October 22, 2009.
2012	Microsoft released Windows Server 2012 on September 4, 2012.
2012	Microsoft released Windows 8 on October 26, 2012.
2015	Microsoft released Windows 10 on July 29, 2015.