Then, when Apple released Mac OS X 10.0 in 2001, version numbering changed completely. When you developed software for Classic Mac OS, it was usually that number which counted most in determining features and compatibility. In the five years from the release of Mac System Software 1.0 in 1986, the major version rose to 7. ![]() In recent macOS, this has risen to x.x.6 at the end of each release cycle. In recent Mac OS X, though, there’s been a new version each year, such as Mojave 10.14 and Catalina 10.15. The second is the minor version number, which in Classic days seldom rose far.The first is the major version number, which ran up to 9 in Classic Mac OS, and has been 10 ever since the first release of Mac OS X.That’s one choice Apple could have come to regret, and this article explains how it’s having to engineer its way out of breaking features in existing apps.Įver since anyone can remember, Apple has identified Mac operating system versions using three version numbers: The surprise announcement of WWDC this year wasn’t the new Apple Silicon Macs, which had been widely expected, but the decision to number the next major version of macOS 11.0 rather than 10.16.
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