January 1984: Macintosh System 1.0
1985: Microsoft Windows 1.0 System
January 1986: Macintosh System 3.0
1987 – 1989
March 1987: Macintosh System 4.0
1987: Macintosh System 5.0
December 1987: Microsoft Windows 2.0
April 1988: Macintosh System 6.0
1990 – 1994
May 1990: Microsoft Windows 3.0
May 1991: Macintosh System 7.0
August 1992: Microsoft Windows 3.1
August 1992: Macintosh System 7.1
1995 – 1997
March 1995: Macintosh System 7.5
August 1995 : Microsoft Window 95
July 1997: Mac OS 8
1998 – 1999
June 1998: Microsoft Windows 98
October 1999: Macintosh System 9
September 2001: Mac OS X 10.1
October 2001: Microsoft Windows XP
Mac OS X 10.5
November 8, 2006 : Microsoft Windows Vista
22 July 2009 Microsoft Windows 7
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