Microsoft’s Windows Phone 7 a mobile OS made its entry in November 2010. Microsoft unveiled Windows Phone 7 on February 15, 2010, at Mobile World Congress 2010 in Barcelona. A few hints highlight that, Microsoft shipped 2 million units of Windows Phone 7 to carriers and yet the actual sales figures are unknown. Interestingly, there are positive responses from the users who actually experienced Windows phone 7 in smartphones. The industry reports says 93% of ‘satisfied’ users for Windows Phone 7 and 90 percent would like to recommend this platform to others. There are quite a few interesting Apps for Windows phone 7. Now the million-dollar question arises like how many Windows Phone 7 based mobile were sold to consumers?