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Microsoft is actually building an Objective-C runtime for Windows 10 aka Project Islandwood as a bridge for iOS apps to run on Windows.

So ironically this announcement might benefit Microsoft a lot.

And if I were Apple, I would not have a problem letting MS foot the bill for the development costs. :)

Because they are probably thinking more in terms of iOS and Android.

They don't really use Windows themselves. They ported it to the platforms they use. Let someone else, probably Microsoft, do it.