redletterdave writes: "Five months after OS X Mountain Lion was released into the wild, Apple's eighth major build of OS X is now also the most-widely used Mac software. In fact, 32 percent of all Macs that went online in December 2012 were running OS X 10.8 Mountain Lion, which was released at the end of July. The second-most-used Mac OS is 2009's OS X Snow Leopard, followed by OS X Lion, which make up 29 and 28 percent of all Mac usage, respectively."
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