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OS X Mountain Lion (version 10.8) is the ninth major release of OS X (formerly Mac OS X. OS X Mountain Lion was released on July 25, 2012 for purchase and download through Apple's Mac App Store, as part of a switch to releasing OS X versions online and every year. Named to signify its status as a refinement of the previous OS X version, Lion, Apple's stated aims in developing Mountain Lion were to allow users to more easily manage and synchronize content between multiple Apple devices and to make the operating system more familiar to users of Apple's more popular mobile operating system, iOS.
The operating system gained the new malware-blocking system Gatekeeper and integration with Apple's online Game Center and iCloud services, while the Safari web browser was updated to version 6. As on iOS, Notes and Reminders became full applications, separate from Mail and Calendar, while the OS X iChat application was replaced with a version of iOS's Messages. Mountain Lion also added a version of iOS's Notification Center, which groups updates from different applications in one place. Integrated links allowing the user to rapidly transfer content to Twitter were added to the operating system from launch. Facebook integration was also planned but unfinished at launch date, and released as a downloadable update later.
OS X Mountain Lion received positive reviews, with critics praising Notification Center, Messages, and speed improvements over Mac OS X Lion, while criticizing iCloud for unreliability and Game Center for lack of games. Mountain Lion sold three million units in the first four days, making it Apple's most successful Mac OS release to date

System requirements

The most basic system requirements of OS X Mountain Lion are 2 GB of RAM, 8 GB of available hard disk or solid state storage, and OS X 10.6.8 or later.] The earliest models supported in Mountain Lion are the mid-2007 iMac, late 2008 aluminum or early 2009 unibody polycarbonate MacBook, mid-2007 MacBook Pro, late 2008 MacBook Air, early 2009 Mac Mini, early 2008 Mac Pro, or early 2009 Xserve Mac Pro models released as early as 2006 can run Mountain Lion unofficially using an upgraded graphics card and EFI64 simulation. The iMac, Mac Mini, MacBook Air, and MacBook Pros released in 2011 or after support AirPlay Mirroring. The same models support AirDrop that did in OS X Lion, the earliest being the late-2008 MacBook Pro, late-2010 MacBook Air, late-2008 MacBook, mid-2010 Mac Mini, or early-2009 Mac Pro with an AirPort Extreme card.