At its dev-focused MIX10 event kicking off today, Microsoft's closing the loop on some of the Windows Phone 7 Series third-party development details it started sharing in the days leading up to GDC last week -- and as you might expect, Silverlight and XNA are the stars of the show. XNA will naturally be the core, critical element of Redmond's gaming story while Silverlight is serving as a catch-all for the "rich internet applications" that make up much of your other mob
