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Windows 7 cracked the 20% share mark last month, a milestone the problem-plagued Vista never reached, a Web measurement vendor said over the weekend.
Windows Vista, meanwhile, fell by half a point to 12.1%, its lowest share since July 2008. Vista peaked at 18.8% in October 2009, the same month that Microsoft launched Windows 7.
Overall, Windows' usage share slipped by half a point to 90.3%, down nearly two points during 2010.
