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en.wikipedia.org/wiki/Macintosh_operating_systems

macOS (originally named "Mac OS X" until 2012 and then "OS X" ... that officially succeeded the classic Mac OS in 2001.

en.wikipedia.org/wiki/MacOS

macOS is the current series of Unix-based graphical operating systems developed and ... Launched in 2001 as Mac OS X, the series is the latest in the family of Macintosh operating systems. Mac OS X succeeded "classic" Mac OS, which was ...

www.apple.com/macos/sierra

Siri makes its debut on Mac, with new capabilities designed just for the desktop. ... The handy features of Siri on iOS are now on your Mac, along with .... System ...

www.apple.com/macos/how-to-upgrade

Before you upgrade, we recommend that you back up your Mac. You should also have your Apple ID and password handy. Then, if your Mac is running OS X ...

support.apple.com/en-us/HT201260

May 15, 2017 ... Check About This Mac to find the version number and build number of your Mac operating system. Knowing the macOS version number can ...

support.apple.com/en-us/HT201686

Nov 17, 2016 ... Avoid using a version of the Mac operating system that is older than what came with your Mac. If you copy older system files from another ...

whatis.techtarget.com/definition/Mac-OS

Mac OS is the computer operating system for Apple Computer's Macintosh line of personal computers and workstations.

www.macworld.com/article/3083346/os-x/macos-sierra-faq-what-you-need-to-know-about-the-new-mac-operating-system.html

Sep 20, 2016 ... This fall, Apple will release macOS Sierra, a major update to the Mac operating system. This FAQ will answer some of the general questions ...

www.amazon.com/Macintosh-Operating-Systems-Software/b?ie=UTF8&node=229660

Results 1 - 12 of 433 ... Mac OS X Version 10.5.4 Leopard Server Unlimited Client ... Mac OS X version 10.6.3 Snow Leopard (Mac computer with an Intel processor ...