Mac Operating Systems By samantha3 Jan 24, 1984 Mac Operating System 1 is introduced Apr 1, 1985 Mac Operating System 2 is introduced Jan 1, 1986 Mac Operating System 3 is introduced Mar 1, 1987 Mac Operating System 4 is introduced Jun 1, 1988 Mac Operating System 6 is introduced May 13, 1991 Mac Operating System 7 is introduced Jul 22, 1997 Mac Operating System 8 is introduced Oct 23, 1999 Mac Operating System 9 is introduced Mar 24, 2001 Mac Operating System 10.0 Cheetah is introduced Sep 25, 2001 Mac Operating System 10.1 Puma is introduced Aug 23, 2002 Mac Operating System 10.2 Jaguar is introduced Oct 25, 2003 Mac Operating System 10.3 Panther is introduced Jun 28, 2004 Mac Operating System 10.4 Tiger is introduced Oct 26, 2007 Mac Operating System 10.5 Leopard is introduced Jun 9, 2008 Mac Operating System 10.6 Snow Leopard is introduced Jul 20, 2011 Mac Operating System 10.7 Lion is introduced Jul 25, 2012 Mac Operating System 10.8 Mountain Lion is introduced