We have an Exchange 2010 SP2 system consisting of a single Mailbox/Hub/CAS server and a single Edge server. The MHC server is exposed to Internet users via a TMG 2010 reverse proxy.
All Exchange web services use a public FQDN in an old DNS domain that we are replacing with a new one; let's call the current public FQDN of the server
webmail.olddomain.com and the new one
We already bought a new certificate for
webmail.newdomain.com (with also the internal server name as a SAN).
Now, what is the best course of action to replace all Exchange external URLs without adversely affecting our users? A simple HTTP redirection should work for OWA, but I'm quite concerned about Outlook Anywhere users (we have lots of them).