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New Listing USB flash drive Mac OS X Mountain Lion Bootable Recover Install Repair. Brand New. $ Buy It Now. Free Shipping. Hard Drive for Mac Pro GB, 3, Preloaded w Mountain Lion 30 DAY RETURNS, 45 DAY WARRANTY, FAST SHIPPING! Pre-Owned. $ In a bit of a double-whammy of operating system news today, word comes that Mac OS X Mountain Lion has gone gold. Apple released the Golden Master (GM) to developers earlier today, and if all Author: Ryan Smith. OS X Mountain Lion (version ) is the ninth major release of OS X (now named macOS), Apple Inc.'s desktop and server operating system for Macintosh computers. OS X Mountain Lion was released on July 25, for purchase and download through Apple's Mac App Store, as part of a switch to releasing OS X versions online and every year, rather than every two years or comienzoweb.comper: Apple Inc.