Exchange 2003 to Exchange 2010 - CoExistence
Posted on 2014-01-03
Some background on the current environment:
150 Mail boxes/ 55 Users
AD=2003 (already prepped for the new exchange environment link updates suppressed)
New mail terminates to Barracuda Spam & Firewall then sent to exchange servers
Exchange= 2003SP2 -
2 backend exchange servers one at headquarters the other at a branch office with a few mailboxes for those in the branch.
1 FrontEnd doing webmail/activesync/rpc-https (webmail.contoso.com w/ssl)
We are upgrading to Exchange 2010 SP1 (I will install sp3 separately) in Coexistence as we want to move mailboxes over slowly until we are comfortable with the new environment. Here are my questions:
1. When I install my first exchange 2010 server (CAS/HUB) will that in anyway effect my existing environment. I read that it creates routing connectors to the existing exchange 2003 servers. Will that impact mail flow from just installing exchange 2010?
2. When installing my first MailBox/HUB will that effect my current exchange environment?
3. I will using a new public dns name for the CAS (mail.contoso.com w/ssl) as to maintain the existing environment without interruption. I understand that eventually I will be making the 2010 server the primary for mail distribution to users still on 2003 as well 2010 and supports legacy web redirect to the existing front end server. Will the new name cause any issues with this?
I am going to start with a couple test accounts. Any tips or warnings are welcomed!
Thank you sincerely,