Mountain Lion: Apple's Mountain Lion Roars At $20

David Pogue delves deeper into Mountain Lion OS for more on what Apple added and what it took away.Mountain Lion is really an incremental update to Apple's existing Lion operating system -- meaning it isn't a total overhaul, just another step in Apple's strategy to bring some of the iPhone and iPad features to the Mac. But it adds some interestingAlthough Messages has been available as beta software since February of 2012, it's now part of OS X Mountain Lion. This app

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