I am in the beginning stages of testing Exchange 2007. Currently I have a single Domain consisting of one Exchange 2003 server and one Exchange 2007(CAS,HUB,Mailbox). they will coexist until I can migrate all mailboxes to the new server. In my DMZ I have a second server running theEdge Transport role. My dilemma is with OWA. If I understand correctly the CAS server handles OWA. I really don't want to open any holes directly to the Exchange server. ISA 2006 appears to be an option buitrequires a 3rd server. I only have about a hundred mailboxes. This seems like overkill to me. Do I even need the Edge Transport? I would love to hear suggestions from anyone who has some ideas on the proper setup for this type of environment. Thanks Greg

Hi, You don't need the edge server - the HUB transport server can be configured to handle most of the edge functions. See http://msexchangeteam.com/archive/2006/11/17/431555.aspx Leif

I would eliminate the Edge Transport server and use an ISA server in that instance. There is a powershell scriptto enable features on the Hub Transport server.