Microsoft Corp.'s Windows OS last month took its biggest market share dive in the past two years, erasing gains made in two of the past three months and sending the operating system's share under 90% for the first time, an Internet measurement company reported today.
In November, 89.6% of users who connected to the Web sites that Net Applications Inc. monitors did so from systems powered by Windows, a drop of 0.84 of a percentage point from October. The decrease was the largest slip by Windows in the past two years and easily bested other recent down months, including May 2008 and December 2007, when Windows lost 0.51 and 0.63 percentage points, respectively.
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