Firstly, it was the great Nokia symbian’s OS, then BlackBerry OS and now is Windows mobile OS (operating system). The huge success of Android OS has lead to the downfall of many OS platform. Microsoft confirms windows phone is dead in a series of tweets saying windows phone is no longer the company’s focus. Joe Belfiore, the Microsoft Corporate VP who is responsible for the mobile OS said that Microsoft will keep supporting the OS with bug fixes but new features or hardwares will not be introduced for its users. In the following tweet, Joe Belfiore explained the decision. He says that developers never really backed up the platform and Microsoft could not find partners to work with. Along with the low number of users and this makes them not to invest on the platform. Instead of inventing a new OS, the company is now concentrated on improving the link between the phone and the PC. The edge browser is another project that is making its way to Android and iOS. However, while that may be his reason, we all know that the huge success of Android OS and iOS platform may lead to the downfall of the platform. The windows mobile OS was not able to keep up with its rival (Android and iOS) hence the failure.