With the continued struggle of Windows Phone to get any kind of market traction, despite finally being mostly on par functionality wise, most of us in the Microsoft world have switched to using iOS or Android mobile hardware.
Surprisingly, these days, it's actually quite an easy coexistence.
Paul Thurrott recently discussed this very topic in an excellent blog post we recommend
What surprised most about this article is just how many applications Microsoft makes for iOS. Well worth a read.