List of Mac OS versions

System 1.0 - 4.3

 * System 1.0
 * System 1.1
 * System 2.0
 * System 3.0
 * System 3.1
 * System 3.2
 * System 3.3
 * System 4.0
 * System 4.1
 * System 4.2
 * System 4.3

System 6

 * System 6.0
 * System 6.0.1 -- release disputed
 * System 6.0.2
 * System 6.0.3
 * System 6.0.4
 * System 6.0.5
 * System 6.0.7
 * System 6.0.8
 * System 6.0.8L -- never officially released from Apple

Regular Systems

 * System 7
 * System 7.0.1
 * System 7.1
 * System 7.1.1 (System 7 Pro)
 * System 7.1.2
 * System 7.1.2P
 * System 7.1.3
 * System 7.5

Performa Systems

 * System 7.0P1
 * System 7.1P1
 * System 7.1P2
 * System 7.1P3
 * System 7.1P4
 * System 7.1P5
 * System 7.1P6

"Mac OS" designation

 * Mac OS 7.5.1
 * Mac OS 7.5.2
 * Mac OS 7.5.3
 * Mac OS 7.5.3L
 * Mac OS 7.5.3 Revision 2
 * Mac OS 7.5.3 Revision 2.1
 * Mac OS 7.5.3 Revision 2.2
 * Mac OS 7.5.4 -- never released
 * Mac OS 7.5.5
 * Mac OS 7.6
 * Mac OS 7.6.1
 * Mac OS 7.6.3 -- existance disputed

Mac OS 8

 * Mac OS 8
 * Mac OS 8.1
 * Mac OS 8.5
 * Mac OS 8.5.1
 * Mac OS 8.6

Mac OS 9

 * Mac OS 9
 * Mac OS 9.0.2
 * Mac OS 9.0.3
 * Mac OS 9.0.4
 * Mac OS 9.1
 * Mac OS 9.2
 * Mac OS 9.2.1
 * Mac OS 9.2.2

Mac OS X

 * Mac OS X Public Beta

Mac OS X 10.0 "Cheetah"

 * Mac OS X 10.0.0
 * Mac OS X 10.0.1
 * Mac OS X 10.0.2
 * Mac OS X 10.0.3
 * Mac OS X 10.0.4

Mac OS X 10.1 "Puma"

 * Mac OS X 10.1.0
 * Mac OS X 10.1.1
 * Mac OS X 10.1.2
 * Mac OS X 10.1.3
 * Mac OS X 10.1.4
 * Mac OS X 10.1.5

Mac OS X 10.2 "Jaguar"

 * Mac OS X 10.2.0
 * Mac OS X 10.2.1
 * Mac OS X 10.2.2
 * Mac OS X 10.2.3
 * Mac OS X 10.2.4
 * Mac OS X 10.2.5
 * Mac OS X 10.2.6
 * Mac OS X 10.2.7
 * Mac OS X 10.2.8

Mac OS X 10.3 "Panther"

 * Mac OS X 10.3.0
 * Mac OS X 10.3.1
 * Mac OS X 10.3.2
 * Mac OS X 10.3.3
 * Mac OS X 10.3.4
 * Mac OS X 10.3.5
 * Mac OS X 10.3.6
 * Mac OS X 10.3.7
 * Mac OS X 10.3.8
 * Mac OS X 10.3.9

Mac OS X 10.4 "Tiger"

 * Mac OS X 10.4.0
 * Mac OS X 10.4.1
 * Mac OS X 10.4.2
 * Mac OS X 10.4.3
 * Mac OS X 10.4.4
 * Mac OS X 10.4.5
 * Mac OS X 10.4.6
 * Mac OS X 10.4.7
 * Mac OS X 10.4.8
 * Mac OS X 10.4.9
 * Mac OS X 10.4.10
 * Mac OS X 10.4.11

Mac OS X 10.5 "Leopard"

 * Mac OS X 10.5.0
 * Mac OS X 10.5.1
 * Mac OS X 10.5.2
 * Mac OS X 10.5.3
 * Mac OS X 10.5.4
 * Mac OS X 10.5.5
 * Mac OS X 10.5.6
 * Mac OS X 10.5.7
 * Mac OS X 10.5.8

Mac OS X 10.6 " Snow Leopard"
The features of this version are promising more speed and better memory usage. Friday, August 28th release.

Failed Systems
These system were projected or even worked on before Apple officials applied the brakes; as a result, they never met the light of day.


 * Copland
 * Gerschwin