Mac OS X Public Beta
Operating system
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Mac OS X Public Beta was the first publicly available version of Apple Computer's Mac OS X operating system to feature the Aqua user interface. It was released to the public on September 13, 2000 for US$29.95. Wikipedia
Default user interface: Aqua
Developer: Apple Computer
OS family: Macintosh; Unix-like (Darwin/BSD)
Released to manufacturing: September 13, 2000