Yes, Unified Messaging is only available with the Partner Messaging. All software is included. You may want to go to Avaya/support and download the documentation for the PM R7.0 before ordering.

And yes, they have to have an Exchange or other email server.

-Hal

CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.