I have a Lumia 520 and I am trying to sync with iTunes on Windows 7. When I start the "Windows Phone app for desktop" program, it does not show anything from iTunes. I just get a "It's lonely in here..." message. I have checked the settings and it says "Sync music, videos and more from iTunes". I have the latest version of the application.
Eventually this was "fixed" by the latest version of the Windows Phone app and iTunes, but it took a few months before the two seems to play well together.
Even then, it would successfully sync once. Subsequent syncs failed when trying to delete files from the phone.
I should not be surprised, I've owned ms devices since the 90s and sync has always been a problem for them.