Microsoft (NASDAQ:MSFT) has begun rolling out Windows Phone 7.5 (Mango), and Engadget's in-depth...

Microsoft (NASDAQ:MSFT) has begun rolling out Windows Phone 7.5 (Mango), and Engadget's in-depth review of the mobile OS is largely positive. While claiming Mango still has some "hiccups," reviewer Brad Molen believes its user interface and feature set make it a legit rival to Android (NASDAQ:GOOG) and iOS (NASDAQ:AAPL). (more)