
Chillingo director Joe Wee, the developer behind Angry Birds and six other #1 hits in the App Store, says he is "ignoring their requests for now because Apple iOS is the only “commercially viable” mobile platform for him."
Angry Birds has sold over 4 million copies, so it is clear that both Google and Microsoft want to get such a popular developer onto their platforms, which are currently smaller in market size than that of the iPhone.
While Android continues to take market share with strong growth, Microsoft has lagged behind, with Windows Phone 7 not even released yet.