I administer an Exchange 2007 system. My company would like to host e-mail for another company. They have and will have their own AD domain and we plan no trust relationships. We have a CRM server and a CRM gateway running on an Exchange 2003 server that is devoted to that task. They have a CRM server in their domain that talks to Exchange 2003.
What do I need to do to get their CRM server to talk to my Exchange system after I start hosting their e-mail domain?
Please note that I don't know a lot about CRM.