If your app is not in the Windows Phone yet, perhaps you should start adding it to the new market. The tools are super-friendly, I believe Microsoft has the best (and most extensive) set of tools in the market: it’s hard to even compare Expression Blend and Visual Studio with C# and Silverlight for writing apps with stuff like Android’s Eclipse or XCode with ObjectiveC, or Appcelerator. They are truly polished new generation tools: heck, you can even prototype your apps in PowerPoint with things like SketchFlow! What can be easier?
This set of links will get you started in no time. Links for Windows Phone 7 Developers.