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Mac OS v.10.12 Introduction: M acOS Sierra (version 10.12) is the thirteenth major release of macOS (previously OS X ), Apple Inc.'s desktop and server operating system for Macintosh computers. The successor to OS X El Capitan, it is the first version of the operating system issued under the June 2016 rebranding as macOS. Sierra is named after California's Sierra Nevada mountain range. I ts major new features concern Continuity, iCloud, and windowing, as well as support for Apple Pay and Siri. T he first beta of macOS Sierra was released to developers shortly following the 2016 WWDC keynote on June 13, 2016. The first public-beta release followed on July 7, 2016. It was released to end users on September 20, 2016 as a free upgrade through the Mac App Store. macOS Sierra desktop Developer Apple Inc. OS family Macintosh Unix Source model Closed , with open-source components Initial release September 20, 2016 ; 3 mont

Mac OS x v.10.11  Introduction: OS X El Capitan(version 10.11) is the twelfth major release of OS X (now named macOS) , Apple Inc. 's desktop and server operating system for Macintosh computers. It is the successor to OS X Yosemite and focuses mainly on performance, stability and security Following the California landmark-based naming scheme introduced with OS X Mavericks , El Capitan was named after a rock formation in Yosemite National Park , signifying its goal to be a refined version of Yosemite. El Capitan is the final version to be released under the name OS X; its successor, Sierra, was announced as macOS Sierra . The first beta of OS X El Capitan was released to developers shortly following the 2015 WWDC keynote on June 8, 2015. The first public beta was made available on July 9, 2015.here were multiple betas released after the keynote. OS X El Capitan was released to end users on September 30, 2015, as a free upgrade through the Mac App Store .

Mac OS- Versions Mac OS x v.10.10  History: OS X Yosemite   (version 10.10) is the eleventh major release of OS X (now named macOS) , Apple Inc. 's desktop and server operating system for Macintosh computers. OS X Yosemite was announced and released to developers on June 2, 2014 at WWDC 2014 and released to public beta testers on July 24, 2014. Yosemite was released to consumers on October 16, 2014 . Following the California landmark-based naming scheme introduced with OS X Mavericks , Yosemite is named after the national park . Features: Here are some features that differ from previous releases of OS X: Improved multiple display support: The menu bar and the Dock are available on each display; Apple TV can be used as an external display. Mission Control has been updated to organize and switch between Desktop workspaces independently between multiple displays. Finder enhancements, including tabs , fullscreen support, and document tags .Pinch-to-zoom

Mac OS- Versions Mac OS x v.10.9 History: OS X Mavericks (version 10.9) is the tenth major release of OS X (now named macOS), Apple Inc.'s desktop and server operating system for Macintosh computers. OS X Mavericks was announced on June 10, 2013, at WWDC 2013, and was released on October 22, 2013, as a free upgrade through the Mac App Store worldwide . The update emphasized battery life, Finder improvements, other improvements for power users, and continued iCloud integration, as well as bringing more of Apple's iOS apps to OS X. Mavericks, which was named after the surfing location in California , was the first in the series of OS X releases named for places in Apple's home state; earlier releases used the names of big cats. Images: Developer Apple Inc. OS family Macintosh Unix Source model Closed source (with open source components) Released to manufacturing October 22, 2013 ; 3 years ago Latest release 10.9.5 (Build 1