Microsoft has released a terrific whitepaper covering their own implementation of Exchange Server 2007 Unified Messaging. The paper is available for reading or download on here on Technet, along with a Powerpoint presentation and webcast for IT pros.
This technical white paper discusses how Microsoft IT designed and deployed an Exchange Server 2007–based unified messaging solution to support an increasingly mobile workforce with flexible and convenient access to voice mail, fax messages, calendar items, tasks, contact information, and e-mail messages in a single repository—the user’s mailbox.
I’m currently staring down the barrel of a couple of UM deployments internally and for customers so if you are like me you might find this sort of information to be invaluable.