I am preparing to install Exchange 2010 for the first time and was confused about one of the command line switches. I am installing in Co-Exist mode.
Our current setup is an exchange 2003 server on the internal lan and an OWA frontend server on the DMZ. I am trying to mimic this with the new install.
I am using the command:
setup.com /mode:install /roles:CA,HT,MB /EnableLegacyOutlook /LegacyRoutingServer:CurrentExchange2003Server.domain.com
I see there is also a switch /ExternalCASServerDomain. What is this switch for? I read on microsoft's site that it is to enable OWA via the internet, although it seems to assume that the CAS server is internet facing and that would not be the case in this instance as this is going to be the new internal mailbox server. Is this switch only used on the CAS if it is on the DMZ and internet accessible?
Will the current OWA server still function if this switch is left out?