My CTO would like our Exchange environment to have an OWA URL that would direct the user to the correct Exchange server, so: Users logs into https://webmail.domain.com/owa => Page displays Go to Exchange 1 or Exchange 2. I have the two Exchange servers setup and working, but I think I'm missing something. My suspicion is that I need a 3rd CAS server that is simply used to point the users to the correct server. Does this sound right?
Are you planning on staying with Exchange 2010 for a long time?
Exchange as a CAS can proxy the OWA connections. With a front-end server, you can have it display the content of whichever backend server the mailbox is on, without redirecting the user to a different server.
Do you have a "ExternalURL" property on the relevant virtual directory?