Microsoft’s Modern UI design language has arrived in many applications with varying success. By now, almost everybody has seen Modern UI, and Microsoft seems committed. Developers of Windows software have to think about the fact that a lot of established interfaces look out of place in a Modern UI environment. It needs to be adapted to the current state of interface design, even more with Apple moving iOS 7 in a similar direction. Working on such updates, we have collected a set of 10 design principles we call, for the sake of simplicity, “Desktop Modern UI”, and we want to share them with you.