I'm new to Exchange Server 2007 and am in the early stages of planning the installation and deployment. This server will be used in a company with approximately 25 users. My plan is to use a one machine for Client Access, Hub transport, Mailbox, and Unified messaging. What are the hardware requirements for the machine that will be running the Edge Server role? Are they different than the machine that will be running the other four roles? Would 25 CALS be required for the edgeserver and 25 for the server running the other four roles? Thanks

You will find all Hardware requirements here (all roles) http://msexchangeteam.com/archive/2007/01/16/432222.aspx All clients only need one CAL for all Exchange server I don't even think that you need a CAL for the EDGE server You do need an Exchange Server License for every server you have Deli

Thanks for the response, just to clarify the server licensing answer. A basic Exchange installation withfour serverroles on one physical server and the Edgerole on a secondphysical server requires two Exchange licenses at $700 each?

Yes two Exchange Standard Server Licenses will do Deli