Microsoft has announced Windows 10. (What happened to Windows 9 you may ask — who knows?) Details are sparse, but they did say that it will run on all devices a la Windows 8, but will configure itself for the device type. So PC users will see a Windows 7 interface while phone users will get a start screen with tiles. Also, there will be a single app store with apps that run on all platforms and devices. Sounds like they learned from Windows 8.