Build list legend
|Version of OS X|
OS X Mountain Lion, or OS X 10.8, is the ninth major release of the OS X operating system released on 25 July 2012. It was announced on 16 February 2012 on Apple's website. It introduced various revamps to the Lion user interface and fixed many of the paradigms that were found to be controversial in Lion.
Like in iOS 11, this version of OS X is the first to drop support for 32-bit kernels and corresponding 32-bit EFI BootROM Macs. The decision to drop 32-bit architectures was made relatively late in the development process, as Beta 1 (12A128p) shipped with a 32-bit kernel. This version drops support for NVIDIA GeForce 6000/7000 Series, ATi Radeon X800/X1000 Series and Intel GMA 900/950/3150/X3100 (Mobile 965 Express Chipset Family) graphics cards.
It is the first version to be released under the OS X name. It is also the first version to be released under the new annual release schedule for the operating system in which newer versions of OS X will be released annually in order to be consistent with the release schedule for iOS.
It is the last version of OS X to be released as a paid upgrade as subsequent releases would be released as free upgrades starting with OS X Mavericks.