We run Exchange 2003 and we are migrating to Exchange 2010 SP2.
When installing the first CAS/HT server. We get prompted with the following question:
Configure CAS server external domain....
The CAS server role will be internet-facing. Enter the domain name you will use with your external CAS server (for example mail.contoso.com)
On the EX2003 env - The A record for the mail server is mail.mydomain.com my OWA is reached via webmail.syracuse.com
I guess I am a little confused with this name - Does the name means the WebApp (CAS) which will be webmail.domain.com or is the A record for your mail server?