I am planning an upgrade from Exchange 2007 to Exchange 2013 and I have some OWA and Activesync questions. First, I've done quite a bit of research reading thru the Technet guides, Exchange Deployment Assistant and also going thru the book Mastering
Exchange Server 2013.
Once I install the first Exchange 2013 CAS server, I'm not really sure what happens next or what I should expect.
1) Exchange Deployment assistant says "As part of the upgrade process, this FQDN will be moved from your Exchange 2007
server to the new Exchange 2013 server. Your Exchange 2007 server will be assigned a new FQDN, such as legacy.contoso.com."
It looks like this is a manual step, not something that happens automatically. Is this correct?
2) Just because the first 2013 CAS server is installed, this does not affect any clients (OWA and Activesync) that are still on the 2007 server until I change DNS or firewall settings to go to the new Exchange 2013 CAS.
Is this a correct understanding?
3) If I'm understanding how this works correctly (question 1 and 2), then at what point do I change the virtual directories in Exchange 2007 to "legacy.domain.com"? My concern is that as soon as I change the VDirs, then all the clients
may not be able to access the servers or they'll get an SSL cert error. I'm assuming I would want to do this at the same time that I'm changing DNS and firewall settings to point to the new Exchange 2013 CAS server.
Current Setting webmail.domain.com --> Public IP 1.1.1.1 (NAT) --> internal IP 172.30.8.12 (Exchange 2007 CAS)
Changes to be made (at the same time):
a) Change firewall NAT to point to new internal IP 172.30.8.13 (Exchange 2013 CAS)
b) Change Vdirs in Exchange 2007 CAS server
Is this correct?
4) Once I make the necessary DNS and firewall changes to point OWA and Activesync clients to the new Exchange 2013 CAS servers, (assuming the client mailboxes are still on 2007 servers) will these clients get an SSL cert error when they get redirected to
the legacy servers (i.e. "legacy.domain.com") ?
Per Exchange Deployment Assistant:Your end users will not see or use the legacy host name. It will be used by Autodiscover and Client Access servers when redirecting legacy users to a legacy server.
5) Do I need to create an external DNS record and a public IP address for "legacy.domain.com" ?
Exchange Server Deployment assistant says: You might need to make changes to your firewall to support this new legacy host name. You might need to add new firewall rules, add an external IP address for your
Exchange 2007 server, or make other configuration changes.
I am thinking, if the client never sees that name "legacy.domain.com", why do I need to create a DNS record and external IP?