IDC - Windows Phone now has 3.5% of the smartphones worldwide market share in Q2 2012

Windows Phone according to IDC now has 3.5% worldwide marketshare.IDC also reports that the success of Android and iPhone OS comes at the expense of competitors in decline,who were market leaders in the past such as Symbian and BlackBerry, both fell below the 5% market share, although the senior analyst Kevin Restivo said that the struggle for supremacy is far from over. 

The success of the Android mobile platform would be mostly from Samsung, which produced 44% of all smartphones based on Google's mobile platform sold in the period under review. Also according to IDC  5.4 million Windows Phone smartphones were sold in Q2 2012 which is 3.5% of the total  market and comparing this to Q2 2011, Windows Phone had a 115.3% growth.
IDC on Windows Phone commented:

"Windows Phone 7/ Windows Mobile narrowed the gap between itself and BlackBerry last quarter in its bid to become the number 3 mobile OS in terms of market share. The share gains it made last quarter are due mostly to Nokia, which almost doubled its Lumia/Windows Phone shipments sequentially. Though it's closing in on the third spot, Windows Phone is still a distant competitor to Android and iOS. Microsoft will need to generate additional momentum from Windows Phone 8 devices, which will be introduced this fall, if it is to narrow the share gap further between itself and the three mobile OS leaders."

Source: IDC