IDC predicts Windows Phone 7 as #2 Mobile OS by 2015 overtaking iPhone
IDC Worldwide Quarterly Mobile Phone Tracker, March 29, 2011 predicts that Windows Phone 7 will overtake Apple’s iPhone to become the Number 2 smartphone in the market .
As per the prediction , Google’s Android will still remain dominant in the smartphone business until 2015 .
“Android is poised to take over as the leading smartphone operating system in 2011 after racing into the number 2 position in 2010,” said Ramon Llamas, senior research analyst with IDC’s Mobile Devices Technology and Trends team.”
Here is the predicted numbers

Source : IDC Forecasts Worldwide Smartphone Market to Grow by Nearly 50% in 2011