it sounds odd that ur having troubles logging into ur nokia account. i havent had any problems. maybe go into a Nokia Care store, get them to check it out... it could be a one off bad manufactured phone *shrugs*

i dont much about iTunes (hate the stuff).. but, i remember reading somewhere that Nokia Link (or was it Nokia Suite) gives you the capabilities to transfer ur songs from iTunes to ur phone (so im assuming, if it needs to convert, itll do it for you... but once again, im not too sure as iv stayed clear away from iTunes and any iProducts)

but yeh, probz check with Nokia Care.. they can help with ur log in issues