I was wondering if someone could point me in the right direction on this. I have just finished installing Exchange 2007, and for the time being, our company will remain in a coexistant state with Exchange 2003. My question is in regards to setting up Exchange 2007 OWA for external access. Internally, Exchange 2007 OWA is working perfectly. However, I'm not 100% sure of how I need to configure it for external access. I did notice that there is a configuration URL for internal and external access. Right now, internal communications is pointing to https://exchange2007.domain.com/owa. Do I need to leave it at this for external access as well?
I'm venturing to guess that I need to setup a new host (A) record in our hosting providers DNS that points to exchange2007.domain.com. Is that correct? We are running a Watchguard 750 firewall and I'm assuming that I just create a new policy opening port 25 to the new IP address.
Also, will there be any issues with having the 2003 OWA and 2007 OWA active at the same time since they are referenced by different (A) records? Can both be used?