We currently have a 2003 Exchange server and need to do the transition to Exchange 2010. I'm a bit confused and it's all related to the forwarding of OWA and RPC over HTTP clients from 2010 to 2003 while we make the transition. Our current environment is a 3rd party ssl cert (mail.domain.com) is applied to the Exchange 2003 server. We don't have an ISA or TMG firewall, so we have a public ip for our e-mail environment on our firewall and ports 443 and 25 get forwarded to our Exchange 2003 box. This is where I get confused. I realize I need to order a new SSL SAN cert with (mail.domain.com, autodiscover.domain.com & legacy.domain.com). I apply that cert to the Exchange 2010 box, but do I also take off the current mail.domain.com cert from the Exchange 2003 box and add the new SSL SAN cert so 2010 knows that the Exchange 2003 has legacy.domain.com? How does the Exchange 2010 box know that 2003 is legacy.domain.com? Do I add that to the internal DNS? What about external? Do I have to burn up another public IP for legacy.domain.com for that? Probably dumb questions, but I'm very confused over the redirection.
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