We are planning on migrating from 2003 to 2007.
We are wondering about the HUB transport role. Our 2003 server is currently acting as a mailbox, CAS and hub transport for all of our mail.
When we migrated a few mailboxes to the new 2007 server, new mail weren't being delivered to the mailbox, regardless of the CAS and our clients connectivity. The actual email from inside or outside wasn't being delivered to the migrated mailbox.
Is the 2003 Exchange server not capable of the hub transport role to the new 2007 mailboxes?
As we decide upon our migration design, we need to know whether we have to put a 2007 hub transport role in place?
We are already thinking of putting a dedicated 2007 CAS server in place, and then migrating our mailboxes to a separate 2007 server with CAS and mailbox roles in place, but what about the HUB transport?
When and where do we move the SMTP mail that is being published to our 2003 server to one of the two 2007 servers, and which one should be the hub transport?