Nokia Messaging is buggy for me. It was working great at first and then one day it just stopped syncing. No reason whatsoever. I deleted the account from the phone and added it again to make it resume function. The other day, I was getting tons of emails. More than NM could seem to manage. The app just quit on me and then the account disappeared altogether. I then added the accounts again through the account wizard and I'm up and running again. It's great when it works, but seems buggy.