If the name change for the object ID also changed the email address then you will need to treat them as a new user and add them to the BES. Once added you can remove the old email address account from the BES. When I did this I did not have to wipe the handheld, however, you do have to watch for duplicate entries in the calendar and address book. Make sure there is a good backup through BlackBerry Desktop Manager before starting. It sure saved me.
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