I have just upgraded from exchange 2003 to 2010 and have moved over almost all mailboxes. The blackberry and android phones can successfully receive email. I cannot however get the users with windows phones to sync. I have already installed the personal cert on the phone so no certificate errors. I put in all the correct information but when trying to sync it will keep popping up saying that the account information is incorrect. has anybody come accross this issue and if so what is the fix.