Nielsen have published some market research which shows that Windows Phone (which includes Windows Mobile and Windows Phone 7, but surely WM sales are miniscule now) has hit 7% of new smartphones sales in March 2011. An NDP survey in Q4 2011 had shown Windows Phone had only 2% market share in that period.At 7% it is around half the 15% market share of RIM in USA, with Windows Phone 7 only available on AT&T, T-Mobile and Sprint. The numbers will likely see a significant surge when Windows phones become available on Verizon and opens up the possibility of Windows Phone overtaking RIM sales soon.