In Pictures: Mac OS X's 9 lives

In 21 years, Apple's reinvented Mac OS has pushed computing in vibrant new directions. Now a new version is imminent

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Mac OS X "Cheetah" (10.0)

Reign: March 2001-September 2001

Key new capabilities: First Mac OS to be based on Next's NextStep rather than the original "classic" Mac OS

Notes: Cheetah was considered a slow, incomplete product and gained little adoption, but it was Apple's first realized attempt to reinvent Mac OS after five years of failed attempts. It was based on Mac OS X Server, released in late 1999, as a version of Unix with a modest graphics front end and heavy reliance on Web-based access to server tools.

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