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Top Operating System Share Trend  | March, 2009 to January, 2010 |
 | | | Month | Windows XP | Windows Vista | Windows 7 | Mac OS X 10.5 | Mac OS X 10.6 | Linux | Other |
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| | March, 2009 | 75.02% | 16.44% | 0.26% | 2.96% | 0.00% | 1.01% | 4.31% | | April, 2009 | 74.47% | 17.00% | 0.31% | 3.03% | 0.00% | 1.06% | 4.14% | | May, 2009 | 73.72% | 17.36% | 0.56% | 3.17% | 0.00% | 1.17% | 4.01% | | June, 2009 | 73.62% | 17.58% | 0.75% | 3.22% | 0.01% | 1.00% | 3.83% | | July, 2009 | 72.93% | 17.90% | 0.89% | 3.42% | 0.02% | 1.05% | 3.78% | | August, 2009 | 71.79% | 18.80% | 1.18% | 3.45% | 0.06% | 0.94% | 3.77% | | September, 2009 | 71.51% | 18.62% | 1.52% | 3.03% | 0.77% | 0.95% | 3.61% | | October, 2009 | 70.48% | 18.83% | 2.15% | 2.82% | 1.17% | 0.96% | 3.59% | | November, 2009 | 69.05% | 18.55% | 4.00% | 2.61% | 1.38% | 1.00% | 3.41% | | December, 2009 | 67.77% | 17.87% | 5.71% | 2.47% | 1.60% | 1.02% | 3.57% | | January, 2010 | 66.15% | 17.47% | 7.57% | 2.37% | 1.80% | 1.02% | 3.62% |
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