I am investigating the Mitel 3300 to use for our phone systems and have a question about unified messaging and faxes. I will have an Exchange 2007 server and have the availability if need be to implement a Exchange 2007 Unified Messaging server and/or a Office 2007 Communications server. That's where I get a little fuzzy on what's needed in conjuction with the Mitel. I want e-mail, voice-mail, and faxes to come to the the user's inbox. So do I need both of these servers?