Change email account servers via login script or .reg file

We're moving to a new Exchange server & our users are already using OL2003 pointing to an old mail server. Is there any way to have user's email accounts (several different email accounts per user) that point to the old server reconfigured to point to the new mail SMTP & POP3 server via a login script or .reg file? I've searched the registry for any ocurrances of the old mail server name but can't find any. I've looked in all the files that Outlook owns in the local user profile and can't find it there either. I suppose it's encrypted somewhere...