I would not happily return to them. In fact, I see no reason why. To me, they are still in their same embrace, extend, extinguish mode only that now their cycle is a lot longer. It could even be that nadella really thinks that he will always be in the embrace and extend phase. My gut feeling is that as soon as it becomes hugely beneficial to them somebody within the company will advocate for the extinguish phase. Don't trust Microsoft. It is in their DNA to screw you.