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History of the Operating System

April Fools Day 1976 1985 1986 1987 1988 1991 1993 1997 2000 March 2001 September 2001 July 2002 October 2003 April 2005 January 2006 October 26, 2007

First Apple System launched. System 2 System 3 System 4 System 6 System 7 System 7.5 Mac OS 8 Mac OS 9 Mac OS 10.0 Cheetah Mac OS 10.1 - 10.1.5 Puma Mac OS 10.2 - 10.2.8 Jaguar Mac OS 10.3 - 10.3.9 Panther Mac OS 10.4 - 10.4.7 Tiger Tiger on intel Leopard on PPC and intel