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Year Event 1983 Bill Gates announces Microsoft Windows November 10, 1983.

1985 Microsoft Windows 1.0 is introduced in November 20, 1985 and is initially sold for $100.00.
1987 Microsoft Windows 2.0 was released December 9, 1987 and is initially sold for $100.00.
1987 Microsoft Windows/386 or Windows 386 is introduced December 9, 1987 and is initially sold for $100.00.
1988 Microsoft Windows/286 or Windows 286 is introduced June, 1988 and is initially sold for $100.00.
1990 Microsoft Windows 3.0 was released 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 October, 1991.
1992 Microsoft Windows 3.1 was released April, 1992 and sells more than 1 Million copies within the first two months of its release.
1992 Microsoft Windows for Workgroups 3.1 was released October, 1992.
1993 Microsoft Windows NT 3.1 was released July 27, 1993.

1993 Microsoft Windows 3.11, an update to Windows 3.1 is released 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 February, 1994.
1994 Microsoft Windows NT 3.5 was released September 21, 1994.
1995 Microsoft Windows NT 3.51 was released May 30, 1995.

1995 Microsoft Windows 95 was released August 24, 1995 and sells more than 1 Million copies within 4 days.
1995 Microsoft Windows 95 Service Pack 1 (4.00.950A) is released February 14, 1996.
1996 Microsoft Windows NT 4.0 was released July 29, 1996.

1996 Microsoft Windows 95 (4.00.950B) aka OSR2 with FAT32 and MMX support is released August 24, 1996.

1996