Mac OS X Lion – 10

Mac OS X Lion – 10.7

OS X Mountain Lion – 10.8

Mac OS X Lion (10.7) is a version of the Mac OS X operating system released by Apple on 20 July 2011. This version dropped support for the x86 userland and architecture and removed Rosetta and Front Row. It introduced the Launchpad and was originally only released as an App Store update that could only be updated normally from Snow Leopard.

OS X 10.8, also known as “Mountain Lion”, is a Macintosh operating system developed by Apple Inc. It’s goal was to start incorporating features found in iOS to the Macintosh user interface. It was released on July 25, 2012

OS X Mavericks – 10.9

OS X Mavericks (version 10.9) is the 11th major release of OS X, Apple’s desktop and server operating system for Macintosh computers. OS X Yosemite was announced on June 10, 2013 at WWDC 2013, and was released in October of 2014. The update places emphasis on battery life, Finder enhancements, other enhancements for power users, and continued iCloud integration, as well as bringing more of Apple’s iOS apps to the OS X platform.