Apple (AAPL) has announced that Mac users can buy an upgrade to the new OS X Mountain Lion from the Mac App Store on Wednesday for $19.99. Apple has posted a complete how-to guide on its website for anyone with an eligible computer who wants to upgrade to OS X Mountain Lion.

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Prior to joining BGR as News Editor, Brad Reed spent five years covering the wireless industry for Network World. His first smartphone was a BlackBerry but he has since become a loyal Android user.