installing 2nd exchange 2007 on the same domain - Certificates + Mail Routing + configuring CAS etc

We are about to install the 2nd exchange 2007 on our domain with CAS, MB & HT roles. My main area of concern lies

1. What considerations must i take when it comes to certificates for the new CAS

2. Mail routing between the old exchange & new exchange server

3. configuring the cas on IIS with OWA, Outlook Anywhere, Active Sync, Autodiscover etc such that once all is working, i want to bring down the CAS on the 1st exchange 2007 and solely use the 2nd exchange.
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Will SzymkowskiSenior Solution ArchitectCommented:
Sorry for the delayed response. You need to have and

That is all you need.

Will SzymkowskiSenior Solution ArchitectCommented:
So you will have 2 parallel installs of Exchange. The high level steps are below...
- Export the certificate (with private key) and import this into the new Exchange server
- Enable the certificate using Enable-ExchangeCertificate -Thumbprint <> -Services "pop,imap,smtp,iis"
- Configure only internal URLs on the 2nd Exchange server (temporarily)
- Mail will continue to route normally
- Hub transport will be redundant (replicate all of the rules you have on old Exchange to the new Exchange server)
- Move Mailboxes to the new Exchange server
- Move Public Folder replicates, OAB's etc
- CAS will continue to flow through old Exchange server (when you have 2 CAS servers in the same site that are not load balanced they become dependent on each other)

Meaning, when you have CAS not load balanced Active Directory only knows that there are 2 CAS servers (not load balanced). So if you simply turn off one of your CAS servers AD will continue to send requests to the server that is also powered off because AD just knows that there are 2 available.

When you are in that scenario you should not be like this for a long time and only during the transition.

- once you have moved all of the mailboxes you need to configure all of your External URLS on the new Exchange Server
- Setup the NAT from the new Exchange server through you firewall to your smart host or Edge etc.
- Completely uninstall Exchange from the old Server

psunithAuthor Commented:
Hi Will,

One question with regards to certificates. Do I need to add the names of my new exchange into my existing certificates?

What names do I need to have on my SSL certificates for Exchange 2007?
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