have a new exchange 2010 integration in process. We decided to create a new domain as the old domain was creating issues, server is old and exchange is having issues with space. Had SBS 2003 with exchange 2003 server. New domain has server 2008 r2 and 2010 exchange installed. The old domain server and exchange 2003 still exists and is being used in production until new exchange is ready. I have one pc logged into the new domain and I have created a test mailbox. would like to get the server sending and receiving test email first, then move mailboxes from exchange 2003 thats in another domain. After I will join other pc's to new domain and have outlook log to the appropriate mailbox. How should I proceed from here? I have created a send connector (smart connector) on the exchange 2010 but it fails to send. Do I need to first add a UCC cert or can I get by without the cert for now? Any thoughts on how to proceed further will be greatly appreciated.