I am setting up a brand new Active Directory infrastructure running on Server 2003 x64 bit editionand a brand new Exchange 2003 server running on Server 2003 standard. I have been able to add the AD users to exchange and have the mailboxes created in the mailbox store. I am unable to have any of these users appear in the GAL or anywhere under the Recipients tab. I have ensured that the GAL has the correct filter rules. The RUS are up and running and have been re-built. All of my users do not have the "Hide for Exchange address lists" checked. I can use whatever help people can give. Thank you!!!

Are you sure that the RUS is pointing to a valid E2K3 server and a valid W2K3 DC? Can you stop the System Attendant and start it, then force the RUS to run again. Finally, download the Exchange Best Practices Analyzer (www.exbpa.com) and run it. It will often reveal weird configuration problems that you did not know you had.