The Classic Mac OS is a general term used to describe the Macintosh system software (Mac OS) before (and not including) Mac OS X. The term is not to be confused with the software-based Classic environment in Mac OS X.

Major versions of the Classic Mac OS:

Macintosh system software
Macintosh System: System 1 | System 2 | System 3 | System 4 | System 5 | System 6 | System 7
Mac OS: Mac OS 8 | Mac OS 9 | Mac OS X

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