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Mac OS X 10.0 (code named Cheetah) is the first major release of macOS, Apple's desktop and server operating system.It was released on March 24, 2001, for a price of $129 after a public beta.
OS X Mavericks (version 10.9) is the 10th major release of macOS, Apple Inc.'s desktop and server operating system for Macintosh computers. OS X Mavericks was announced on June 10, 2013, at WWDC 2013, and was released on October 22, 2013, worldwide.