I've setup my Exchange 2010 server with my email address policies. Of course
there are some acceptions to the rules. I've made changes to those accounts
in the EMC under Recipient Configuration | Mailbox. I edit the account under
the "E-Mail Addresses" tab by adding the diffrent email address, unchecking
the "Automatically update e-mail addresses based on e-mail address policy",
then click the "Set as Reply" button.

If I fire up Outlook 2010, start to compose an email and select that person
from the GAL, it will have the correct email address (the address that
dosen't follow the email address policy).

If I fire up Outlook 2003 and try to select that same use from the GAL it
still has the address that follows the email address policy.

I won't be able to convience managment that we need to upgrade all of our
clients to a later version of Outlook.

This makes no sense to me. How can I update the address so it will appear to
be correct for Outlook 2003?