Earlier this week Microsoft announced an API Mapping tool help iPhone/iOS developers "find their way when they discover the Windows Phone platform."
The API Mapping tool acts as a translation device for iOS developers unfamiliar with Windows Phone 7 coding language. The mapping tool does this by allowing iOS developers to pick out the iOS API calls and quickly look up "equivalent classes, methods and notification events in WP7."
The mapping tool as of now only includes translations for Network/Internet, User Interface, and Data Management related programs. Audio/Video, Graphics/Animation, Performance, and Security related API translations will be added at a later time.
It's important to note this tool is just a starting point for developers to learn about the WP7 platform and by no means will include a translation of all API's between the platforms.
This mapping tool seems to be a very blatant attempt by Microsoft...