One of the main complaints for app developers not comming to Symbian has been that the development using Symbian C++ was difficult.With the introduction of QT the development became a whole lot easier and now you can easily port your app from popular mobile platforms including iOS,Android and Windows Phone 7.

The tool now supports iOS and Android,Windows Phone 7 should be released soon.By supporting Symbian through QT developers can reach an ecosystem with the largest installed base.
http://www.developer.nokia.com/Develop/Porting/API_Mapping

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