Microsoft is launching Windows Phone 7 officially today. Microsoft is coming back to the smartphone OS wars, which it actually never left. Microsoft currently holds 5% of the global smartphone OS market share with Windows Mobile according to Gartner research. Windows Phone 7 would need to gain 9% to catch the Apple iPhone and 12% to take on Android according to Gartner's smartphone OS research. More details on the numbers related to the Windows Phone 7 launch can be found on Reuters.
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Despite the current positive sentiments towards Windows Phone 7 the long term success is still questionable as Android and iOS based phones have a decent head start. More Windows Phone 7 News.