Mac OS X, the tenth major version of Apple's operating system, and the most critically acclaimed of the bunch, is now 10 years old. It's hard to imagine an operating system lasting 10 years with no major redesigns along the way. In honor of this milestone in Apple's history, we invite you to go on a (predominately feline) safari through all of OS X's versions.
[ See also: 10 for X: A decade of Mac OS X ]
The Mac OS X Public Beta, nicknamed "Kodiak", was an early beta version of Apple's Mac OS X operating system Cheetah. It was released to the public on September 13, 2000 for $29.95. It had major differences from the previous operating system, OS 9, most notably the Aqua interface, the dock, and the menu bar, all of which are synonymous with Macs today. (via the Mac Observer)