Windows Phone API Mapping tool: moving from Qt to WP7
The Mapping tool is a kind of dictionary for developers who know the same programming language and want to write applications for the Windows Phone platform with this knowledge. Developers familiar with the APIs of other platforms can use the Mapping tool API to find the appropriate classes, methods, and events in Windows Phone.

Essentially, the Windows Phone API Mapping tool is a subject index for Qt API classes and methods, referencing the corresponding WP7 API classes and methods compiled from the Silverlight, C #, and XNA documentation on MSDN.
Designed strictly for developers, the Windows Phone API Mapping tool includes the main Qt 4.7 libraries for Symbian: QtCore, QtGUI, QtLocation, QtNetwork, QtSql, QtXml, QtWebKit, QML Elements and QML Components. The Mapping tool API has code samples and tutorials that also help developers.

Along with Qt, iOS and Android are introduced in the Windows Phone API Mapping tool. By the way, there is also a reverse API Mapping tool , which facilitates the transition from programming for iOS, WP7 and Android to Qt programming.
If you are absolutely new to Windows Phone development, we also recommend that you read the Windows Phone Guide for Symbian Qt Application Developers guide released by Microsoft and Nokia.", which describes the principles of programming for Windows Phone for developers who wrote Qt for Symbian. The guide consists of eight chapters and includes recommendations on application design, C # programming, porting applications to Windows Phone, and much more.
By the way, Microsoft is now conducting Nokia with Nokia competition for developers of applications for Windows Phone 7. To participate in the competition you need to write a New Year theme application for WP7, and if you are lucky, you can become the owner of the new Nokia Lumia 800 smartphone.