Versions of Mac OS
- System 1.0
- System 2.0
- System 3.0
- System Tools 4.0 (System 3.2, Finder 5.3)
- System Tools 5.0 (System 4.2, Finder 6.0)
- System 6.0 (Finder 6.1)
- System 6.0.5
- System 6.0.7 (buggy)
- System 7.0 (released in late 1991; integrated MultiFinder? into the basic OS)
- System 7.0.1 (introduced with LC II and Quadra series)
- System 7* (System 7 Tuner)
- System 7.1
- System 7.2
- System 7.5
- System 7.5.3
- Mac OS 7.6 (name changed because of the experimental clone? program)
- Mac OS 8.0
- Mac OS 8.1
- Mac OS 8.5
- Mac OS 8.6 (now runs on top of a microkernel; can run [Carbon API]? apps)
- Mac OS 9.0
- Mac OS 9.1
- Mac OS X 10.0 (switch to BSD-derived Darwin? kernel and new Quartz?/Aqua? GUI; includes 9.1, which it runs in a virtual machine)
- Mac OS X 10.1 (major speedups)
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