Apple OS By facebooker_502846066 Jun 1, 1978 Apple introduces Apple DOS 3.1 Jan 24, 1984 Apple introduces System 1 Apr 1, 1985 Apple introduces System 2 Jan 1, 1986 Apple introduces System 3 Jan 1, 1987 Apple introduces System 4 Oct 1, 1987 Apple introduces System 5 Apr 1, 1988 Apple introduces System 6 May 13, 1991 Apple introduces System 7 Jul 26, 1997 Apple introduces Mac OS 8 Oct 23, 1999 Apple introduces Mac OS 9 Mar 24, 2001 Apple introduces Mac OS X 10.0 code named Cheetah Sep 25, 2001 Apple introduces Mac OS X 10.1 code named Puma Aug 23, 2002 Apple introduces Mac OS X 10.2 code named Jaguar Oct 25, 2003 Apple introduces Mac OS X 10.3 code named Panther Jun 28, 2004 Apple introduces Mac OS X 10.4 code named Tiger Oct 26, 2007 Apple introduces Mac OS X 10.5 code named Leopard Jun 9, 2008 Apple introduces Mac OS X 10.6 code named Snow Leopard Jul 20, 2011 Apple introduces Mac OS X 10.7 code named Lion Feb 16, 2012 Apple announces Mac OS X 10.8 code named Mountain Lion, release to follow in summer 2012
