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1984 System 1
1985 System 2
1986 System 3
1987 System 4
1987 System 5
1988 System 6
1991 System 7 Built-in co-operative multitasking
           32-bit clean. Virtual memory. Improved user interface.
1995 Mac OS 7.5.1 Name changed from System x to Mac OS x
1997 Mac OS 8
1999 Mac OS 9 dropped support for 68K macs
OS X is a Unix-based operating system built on technology developed at NeXT, 
the company Steve Jobs started after he was ousted from Apple.
It is a version BSD UNIX.
2001 Mac OS X v10.0 (Cheetah)
2001 Mac OS X v10.1 (Puma)
2002 Mac OS X v10.2 (Jaguar)
2004 Mac OS X v10.3 (Panther)
2005 Mac OS X v10.4 (Tiger)
2007 Mac OS X v10.5 (Leopard)
2009 Mac OS X v10.6 (Snow Leopard) dropped support for PowerPC Macs
2011 OS X v10.7 (Lion) dropped Rosetta, making it incapable of running PowerPC applications.
2012 OS X v10.8 (Mountain Lion)
2013 OS X v10.9 (Mavericks)

Links:
History of Mac OS - Wikipedia
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last updated 3 Nov 2013