Your question is Motivation for Mobile Work. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
What motivates you to work on mobile technologies at Microsoft?
Explain why Microsoft is the right environment for your mobile engineering interests. Connect your motivation to user needs, Microsoft products, and the type of impact you hope to create. Be specific about how your experience and technical strengths would contribute.