As fellow N97 owners who use GMail via MfE know, syncing the e-mails
between GMail and the phone is broken. It will throw a “Wrong
Password” error message. This is despite the fact that same password
is able to sync my GCal and GMail contacts. This however can be solved
by simply turning the e-mail sync off, syncronizing the contacts +
calendar without the e-mails and then turning e-mail sync on again.
After that MfE 3 should sync e-mails again normally 🙂