Yesterday it was 20 years since Apple released the operating system Mac OS X, what we today call macOS.
Mac OS X was the tenth version of Apple’s operating system for Macs and therefore received the prefix “X”. It was a prefix that had to stick with until 2016. In connection with Apple then releasing macOS 10.12 Sierra, Apple renamed the operating system to “macOS” so that it would better follow the naming conventions on their other operating systems.
Above you can check out when Steve Jobs introduced Mac OS X on Macworld in January 2000. It says that Mac OS X would start shipping in January 2001, but it took until March 24, 2001 before Mac OS X finally started rolling out to Mac computers.
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