Rumor is pinpointing the launch date of Windows Phone 7 to 21st October 2010. I checked several sources and it seems that they have the same source of information, El Economista.
So, the first few countries that might launch Windows Phone 7 on 21st Oct are UK, France, Spain, Germany and Italy. However, all these information are rumors and it is difficult to verify.
I do think that Microsoft should do something fast. Based on ComScore, they are already lacking behind in the Smartphone platform usage results.
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