I have an Exchange 2003 running on Windows 2003 server. I have set up an Exchange 2007 server on windows 2003 x64. I have moved over 1 mailbox. All mail was being sent and received ok. Now this mailbox's incomming mail has stopped and the mail gets stuck in the Routing group connector. If I reboot the server all the mail gets cleared and received ok, so I feel like I must have it set up ok. But then I send another mail to it and it gets stuck again. It can send mail ok. I have a smart host in internet mail connector and i have added the routing group to the internet email connector. All the 2003 mailboxes are working fine. My intention is to migrate all mailboxes over to 2007 and stop 2003 exchange.