Question : how to change BES users smtp address

Hello every body
I need to change principal smtp domain of exchange 2003 recipient (old: msft.adds to new: msft.active). All users are connected to BES server 4.1.4. My question is when i change smtp domain on exchange how can modify or update BES users information to match the new smtp domain? and what others repercussions?
Thank for your time

Answer : how to change BES users smtp address

I don't know about the update delay, I cannot imagine it would be long though (if any at all).  As an aside, I would recommend keeping @olddomain.com SMTP addresses so that users will still receive mail from those addresses, just make the @newdomain.com the primary.  All messages (including replys to @olddomain.com) will go out through the @newdomain.com address.