I am in the process of transitioning from Exchange 2003 to 2010 and we have a relatively simple setup: single Exchange 03 server w/ split DNS and low number of users (less than 50). I have completed all of the preliminary requirements for the AD & Exchange Org and have the new Exchange 2010 server installed in the CAS role (in the existing Exchange Org). Everything seems to be working with no problems and I have been following the transition instructions.
I would like to transition to the new server quickly and move all of the mailboxes (at one sitting) and would also like to re-use the existing certificate on our old Exchange 03 server for our Outlook Anywhere clients. Does any one have any experience, instructions or recommendations for doing a quick migration without using a new cert on the new server? Is it as simple as exporting from the old IIS server and importing on the new server (using the cert IIS wizard)?
How much of the old Exchange 03 server do I need to decommision in order to get the email flowing properly to the new server (SMTP and RPC over HTTPS) after the users are migrated? Is it simply a matter of reconfiguring our firewall (non-ISA) to point to our new email server for SMTP traffic to work? Can I migrate one user and test the setup without causing harm to the Exchange Org mail flow (put SMTP Send and Recieve connectors on the new server and have the old SMTP connector running at the same time)?
Do the Outlook Anywhere workstations automatically update the server name when they connect the first time (like normal RPC Outlook connections) or do we have to manually change them to connect to the new Exchange server?
Since we have the split DNS, do I also need to update the host file on the new Exchange server with the external Domain on it to resolve back to itself for the RPC over HTTPS to work?