MacOS has part(s) Mac OS X 10.0
Mac OS X 10.0 (Cheetah)
On March 24, 2001, Apple released Mac OS X 10.0 (internally codenamed Cheetah).
The initial version was slow, incomplete, and had very few applications available at launch, mostly from independent developers. While many critics suggested that the operating system was not ready for mainstream adoption, they recognized the importance of its initial launch as a base on which to improve. Simply releasing Mac OS X was received by the Macintosh community as a great accomplishment, for attempts to overhaul the Mac OS had been underway since 1996, and delayed by countless setbacks.
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