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Apple introduces Apple DOS 3.1
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Apple introduces System 1
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Apple introduces System 2
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Apple introduces System 3
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Apple introduces System 4
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Apple introduces System 5
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Apple introduces System 6
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Apple introduces System 7
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Apple introduces Mac OS 8
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Apple introduces Mac OS 9
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Apple introduces Mac OS X 10.0 code named Cheetah
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Apple introduces Mac OS X 10.1 code named Puma
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Apple introduces Mac OS X 10.2 code named Jaguar
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Apple introduces Mac OS X 10.3 code named Panther
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Apple introduces Mac OS X 10.4 code named Tiger
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Apple introduces Mac OS X 10.5 code named Leopard
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Apple introduces Mac OS X 10.6 code named Snow Leopard
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Apple introduces Mac OS X 10.7 code named Lion
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Apple announces Mac OS X 10.8 code named Mountain Lion, release to follow in summer 2012