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Top Operating System Share Trend  | November, 2007 to June, 2009 |
 | | | Month | Windows XP | Windows Vista | Mac OS X 10.5 | Windows 7 | Linux | Mac OS X 10.4 | Other |
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| | November, 2007 | 83.60% | 7.01% | 0.00% | 0.00% | 0.65% | 0.00% | 8.74% | | December, 2007 | 82.84% | 8.09% | 0.00% | 0.00% | 0.69% | 0.00% | 8.37% | | January, 2008 | 82.77% | 7.83% | 0.00% | 0.00% | 0.72% | 0.00% | 8.68% | | February, 2008 | 82.37% | 8.47% | 0.00% | 0.00% | 0.74% | 0.00% | 8.42% | | March, 2008 | 81.69% | 9.12% | 0.00% | 0.00% | 0.73% | 0.00% | 8.47% | | April, 2008 | 81.40% | 9.38% | 0.00% | 0.00% | 0.76% | 0.00% | 8.46% | | May, 2008 | 80.71% | 10.13% | 0.00% | 0.00% | 0.89% | 0.00% | 8.27% | | June, 2008 | 80.30% | 11.16% | 0.00% | 0.00% | 0.87% | 0.00% | 7.68% | | July, 2008 | 80.11% | 11.67% | 0.00% | 0.00% | 0.83% | 0.00% | 7.39% | | August, 2008 | 79.53% | 12.40% | 0.00% | 0.00% | 0.82% | 0.00% | 7.25% | | September, 2008 | 78.55% | 12.77% | 0.00% | 0.00% | 0.86% | 0.00% | 7.82% | | October, 2008 | 78.32% | 13.59% | 0.00% | 0.00% | 0.77% | 0.00% | 7.31% | | November, 2008 | 77.18% | 14.28% | 0.00% | 0.00% | 0.91% | 0.00% | 7.63% | | December, 2008 | 76.60% | 14.90% | 0.00% | 0.02% | 0.98% | 0.00% | 7.50% | | January, 2009 | 75.86% | 15.72% | 2.57% | 0.13% | 0.90% | 1.19% | 3.64% | | February, 2009 | 75.68% | 15.94% | 2.74% | 0.22% | 0.98% | 1.19% | 3.25% | | March, 2009 | 75.02% | 16.44% | 2.96% | 0.26% | 1.01% | 1.17% | 3.14% | | April, 2009 | 74.47% | 17.00% | 3.03% | 0.31% | 1.06% | 1.11% | 3.03% | | May, 2009 | 73.72% | 17.36% | 3.17% | 0.56% | 1.17% | 1.08% | 2.93% | | June, 2009 | 73.62% | 17.58% | 3.22% | 0.75% | 1.00% | 1.04% | 2.80% |
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