I think you are confused as to what exactly we are debating here. Porting costs are real - somehow Mac software isn't magically a free port to ARM. The porting

I think you are confused as to what exactly we are debating here. Porting costs are real - somehow Mac software isn't magically a free port to ARM. The porting costs depend on code base, complexity, various other things. That's however not what we were debating - the debate was Microsoft has never done it and so it might be hard for them. The counter point I was making was Microsoft has been there and done that and there is no reason to believe Windows software is any harder to port to another platform than Mac Software except for the scale part - Windows just has a ton of more complicated software than Mac has had and porting "toy" Mac apps will be less of an effort than say porting a big Enterprise Windows app. However it isn't fundamentally easier or harder.