Sorry about the title it does not capture exactly what we are trying to do.
Here is the situation. I had one mailbox for 3 people in a dept. They have now been authorized to have there own email address and mailbox but they still want to receive email from the old email address and they don't want to lose the mail that is in that mailbox. This would be easy if I could convert that mailbox into a mail enabled dist group and then add the appropriate permissions without losing the old mail. Is this possible or does anyone have any other ideas?