With Nadela's apparent philosophy of bringing MS back to it's roots (a Software company), this isn't exactly strange if you look from the MS perspective.
But the other side is Apple, Apple is trying to fight MS since ever, they're known for making jokes about MS at their presentations and now we have MS at stage?
The entire audience laughed when the main presenter said "And now let's talk about productivity, you know who is really good at productivity? Microsoft!"
They probably thought it was just another joke, I did too. But then MS logo appeared at the background and they called the guest in to make an Office demonstration using the iPad Pro...
I was like "wtf is happening" for a while.