As recently as a year ago, Windows XP was the kingpin of PCs in the US with 43.1 percent market share. But that's rapidly changing. StatCounter shows that while Mac OS X is creeping up slightly and Windows Vista continues its death march, Windows 7 is on the rise, steadily closing the gap with trusty ole' XP. Last month, XP's share sank to 32.17 percent, while Windows 7's edged up to 30.84 ...

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