Mac OS X 10.0 - (Product release date: 24 March 2001)

Mac OS X 10.1 - (Product release date:  29 Sep 2001) - Free when upgrade from OS X 10.0

Apple Mac OS X 10.2 Jaguar - (Product release date: 24 Aug 2002)

Apple Mac OS X 10.3 Panther - (Product release date: 24 October 2003)