More by virtue of Blackberryâ€™s plummeting market share than amazing Windows Phone growth, it seems the installed base of Windows Phone is set to overtake that of Blackberry in US by the end of November 2012 (around week 47).

The projection is based on extrapolating StatCounter web usage data from the beginning of the year, and would mean there would be more Windows Phones in the wild in USA than Blackberries.

The launch of a new range of Windows Phones in October or November in USA is likely to accelerate the trend, cementing Windows Phone as the (very minor) third player in USA.

It would still leave Windows Phones as a pretty rare sight in USA, with less than 2 in 100 smartphone users using Windows Phone handsets.