Earlier quoted context omitted.
I'm not too worried about it. After all, MS has released Office on iOS, and partnered with Xamarin for iOS development. They'd be insane to buy HockeyApp then kill everything it has and replace it with a Windows Phone only solution. It's weird, but MS is almost one of the best large companies to do cross-platform dev with these days.
I agree with that, but things may be different in 2 years. And MS is also the company that gains the most money with each Android phone sold.
The only reason it would quit on iOS is if it couldn't make any money from iOS users. And the only reason it wouldn't be able to make money from iOS users would be if Apple went down in flames.