Relations between Microsoft and Google are as icy as Nokias hometown of Espoo, Finland, which made it a bit of a shocker when Nokia — by far Microsofts largest mobile partner — dropped an Android-shaped bomb on Windows Phone this week with the introduction of its X handsets. Just weeks away from being swallowed by Microsoft, Nokia is releasing three cheap, Android-powered devices that are designed to appeal to the mass market. Windows Phone has seen a bit of success in this end of the market — and Nokia dominates sales of handsets running it — so why the switch to Android?