Unified Messaging provides the functionality of having voice mail, email and fax to a single location that is the user's mailbox. In Exchange 2007 Unified Messaging the fax feature is limited to inbound fax only. Which means that, an external or internal
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Read the complete post at http://blogs.technet.com/jkruse/archive/2007/04/19/faxing-in-exchange-2007.aspx