Microsoft has extended its service in mobile app development to compete in MARKET with android, iOS and blackberry applications. There are more than 40, 000 windows apps developed in MARKET so far. Microsoft operating system is trusted and is being used from last 25 years. Therefore, Windows mobile has emerged as one of the preferred choice for users. Windows scalability is being admired and applications can operate on number of devices smart phones, portable media centers, pocket PCs etc.