Mac OS X Lion

Mac OS X Lion, or Mac OS X 10.7, is the eighth major release of the Mac OS X operating system released on 20 July 2011. It was announced on 20 October 2010 at Apple's Back to the Mac event. 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.

It is the last version to be released under the Mac OS X name as the operating system's branding was shortened to OS X starting with the release of OS X Mountain Lion in 2012.