![]() ![]() At first their code names for OS X were "big cats" (Puma, Jaguar, Panther, Tiger, Lion etc), from version 10.9 onwards they are code named after locations in California (Sierra, Mojave, Catalina etc). Apple then went on to release new and improved versions of OS X every one to two years. Sierra was replaced by High Sierra 10.13, Mojave 10.14, and the newest Catalina 10.15. Check that third party apps you use have updates available for the new OS. Before upgrading make a full back up of your Mac. Then go to the Download OS section and click on the OS you want to install. In keeping with Apples release cycle, macOS 10.12 Sierra will no longer be receiving security updates. Go to Check Compatibility to see if your mac qualifies for the OS upgrade you want. ![]() OS X was first released in March 2001 (code name: "Cheetah"). Apple has announced the launch of its new operating system, macOS 10.15 Catalina on October 7, 2019. OS X 10.10 Yosemite, OS X 10.11 El Capitan, macOS 10.12 Sierra, macOS. The name change brings it more in line with the naming conventions of other Apple products: namely "iOS" - the operating system for iPhones and iPads. The release version of macOS Ventura (13.0) is now available from the Mac App. MacOS used to be called "OS X" - Apple changed the name to macOS with the release of macOS "Sierra" - version 10.12 - in September 2016. It's based on the UNIX operating system and provides a very attractive and intuitive user interface. It's a multi user, multi-tasking, modern operating system. MacOS is Apple's Operating System for their computers: it's for Macbooks, Macbook Pros and Desktops. ![]()
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