I have looked and looked but neither Outlook, nor BES, nor the exchange server have any place where i can setup the new me@att.blackberry.com. It was working until last week when ATT "kindly" shut down the mycingular.blackberry.com addresses without leaving any instructions on how to make the change

This is driving me bonkers!!! Where do I find this on BES ?

You do this in BIS.

How to add / delete email addresses - BlackBerryFAQ

On the Blackberrry ? What e-mail address should I delete there ?