After months of beating Windows Mobile in quarterly market share by units sold, the number of active iPhone users has surpassed the number using Windows Mobile-based devices, according to the latest survey by research firm comScore. While WinMo has held steady of the last year, the iPhone has grown significantly since the launch of the iPhone 3GS this past summer.

comScore conducts monthly surveys about mobile phone usage; the data used in the chart above represents three-month averages of that data through the month of October. You can see that the number of active WinMo, Palm (including ...

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