You're missing something big here: Software support. In the past it was completely reasonable to develop all your stuff Win-only. Hence the lock-in, hence the m

You're missing something big here: Software support. In the past it was completely reasonable to develop all your stuff Win-only. Hence the lock-in, hence the market share. Nowadays, even in forward looking big corps, when new software projects are planned, Android and iOS support is usually not only considered but a priority. That's why we see more and more software becoming POSIX compatible. And once this is all done, the OS becomes completely interchangable, at which point MS looses big time, they basically loose their long time business model of domination through Windows market share. Once this transition has been completed, MS will become a Software company like all the others, they won't have any home turf advantage anymore. For this reason I'm very skeptical whether MS will allow the Office port. It would basically show that they have accepted their fate (which would be a good sign for their management however).