Both Microsoft's Phil Spencer and Terry Myerson have taken to the stage this week at BUILT 2016 to assure the public: they're open. Not just open for more developers - not just open for development - but an open ecosystem. Their comments ring particularly important after a recent comment by Epic Games' Tim Sweeney about how the Universal Windows Platform must die. Obviously Microsoft does not want that to happen. At BUILD 2016 this week, Microsoft representatives on stage have made that clear.