At my office we have a situation with one user on Win 2000, Outlook XP, Exchange server 2000. He has clients whose email addresses have changed (i.e.,, to and when he edited the email address in Contacts the change seemed to go in just fine. But when he sends an email to the message goes to and is sent back as "message undeliverable." I can't find the incorrect email addy anywhere.

Anyone know what we need to do to correct this?