Microsoft (MSFT) on Monday during its Windows Phone 8 press event in San Francisco announced a new version of Skype for its mobile operating system. The program is always running in the background to ensure that users will never miss an incoming call or message from a friend ever again. The application also allows users to message and video chat with contacts directly through the Windows Phone 8 Peoples hub. Joe Belfiore, the head of Microsoft’s Windows Phone team, revealed that unlike other apps that run in the background, Skype will not drain the smartphone’s battery. “We’ve built Skype so it integrates naturally into the phone experience… it’s always on, so it can receive a call and message at any time… without draining your battery,” said Belfiore. The Skype app is available now for Windows Phone 8 devices.