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How to add a new domain to Exchange 2003

Last Modified: 2012-08-13
We will be changing our domain name but want to keep our old domain in Exchange 2003.  This way any email destined for the old domain name will be delivered.  We have changed it with DNS and I have added the domain to the Default Policies under Recipient Policies.  

I have tested with several users and made the new domain their primary and it is working correctly as planned.  I have only changed this on about 5 out of 267 users.  We have one external domain (.net) and one local (.local).  We only have one Exchange server running 2003.  

How can I add the new domain to the other 262 users and service accounts as well as make the new domain the primary for everyone?  Also keep in mind that we would like to keep the old email domain too.  
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