Mac OS X v10.0 "Cheetah" - March 24, 2001
Mac OS X v10.1 "Puma" - September 25, 2001 (6 months)
Mac OS X v10.2 "Jaguar" - August 24, 2002 (11 months)
Mac OS X v10.3 "Panther" - October 24, 2003 (13 months)
Mac OS X v10.4 "Tiger" - April 29, 2005 (18 months)
Mac OS X v10.5 "Leopard" - October 26, 2007 (30 months)
Mac OS X v10.6 "Snow Leopard" - August 28, 2009 (22 months)
Mac OS X v10.7 "Lion" - July 20, 2011 (22 Months)
verkar hyffsat likt microsoft i år imellan. men visst, microsoft har hoppat runt mer mellan olika grafiska utseénden.