<A target="_blank" href="http://www.zdnet.com/blog/microsoft/could-lodsys-turn-its-sights-on-microsoft-windows-8-developers/11056">Lodsys owns a patent covering in-app purchasing through an app store</A>. They have already filed suits against developers writing apps for iOS, Android, and BlackBerry. Since Microsoft is using the same process for their Win8 app store, developers may find themselves targeted by Lodsys.