Welcome Home for Windows is a desktop app which helps you to import all your old phone contents into Nokia Lumia phones. Now "Welcome Home for Windows Phone" has been updated for the new Lumia phones that are running Windows Phone 8.
How does it work
# Just load Welcome Home for Windows Phone application on your computer ( PC or Mac)
# Plug in your new Lumia and the application copies over your contacts, calendars, videos, photos and music from your old iPhone, BlackBerry or Android phone.
In a few guided steps, all contents is pulled off your old phone and imported into Nokia Lumia. (Includes the Nokia Lumia 920, Lumia 820, Lumia 822 and Lumia 810. )
Welcome Home for Windows Phone is free app and you can download it from here.