Windows Phone 7 is the successor to Microsoft's Windows Mobile operating system. It runs on the Windows CE 6 kernel and was developed to have a completely re-mastered interface from previous Windows mobile versions, taking design cues from the Zune HD with a multi-touch interface and integration of social networks and Xbox gaming. It requires specific hardware specifications including a large screen, dedicated buttons, and mobile processors. It features hubs for contacts, photos, games and music integrated with social networks and Xbox Live.