The first Mac software was called System 1 and it was released on January 24, 1984, and there have been 30 major updates since. Apple rebranded to Mac OS with the release of mac OS 8 on July 26, 1997.
Tom's Hardware on MSN
Apple’s Mac OS X turns 25, has prospered across three hardware architecture changes
It replaced the polished but limited Mac OS9 with a UNIX-underpinned reimagining of computer operating systems.
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