Mac OS X Lion

A preview of Lion was publicly unveiled at Apple's "Back to the Mac" event on October 20, 2010. It will bring many developments made in Apple's iOS, such as an easily-navigable display of installed applications, to the Mac, and will include support for the Mac App Store, as introduced in Mac OS X Snow Leopard version 10.6.6. On February 24, 2011, the first developer's preview of Lion (11A390) was released to subscribers of Apple's developers program. The latest preview (build 11A459e) was released on May 13, 2011. It was scheduled to release on Summer 2011.

In a press release by Apple on May 31st, 2011, an announcement was made that this new release will be unveiled by Steve Jobs on June 6th at the WWDC 2011. This was the last Mac OS developed before Steve Jobs died.

It is also the first version of Apple's OS to be referred to as "OS X", dropping the "Mac" from the name of the operating system

A Intel Core 2 Duo or newer processor and 2 GB of RAM is required.