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The first desktop version, Mac OS X 10.0, was released on March 24, 2001. Mac OS X 10.5 Leopard, Mac OS X 10.6 Snow Leopard and all releases from OS X 10.8 Mountain Lion to macOS 14 Sonoma are UNIX 03 certified
I don’t like MacOS, but it’s actually able to be called UNIX.
I’m surprised you don’t lose Unix certification with crap like case insensitive filesystem defaults.
I don’t want to be like Stack Overflow, but tbh you have some design problems if you rely on case sensitive filesystems.