In Presence 8 has anyone used ADAM (AD LDS) to integrate a single Presence Cluster to multiple domains.  Looking to integrate multiple domains that we are authenticating UCM via ADAM and I am trying to not have to have 6 separate clusters (One per forest- federated together) of Presence to support the same user community.

Any caveouts/issues or straight incompatability.  Based off of all the calandering requirements and integrations points to the Enchange and other domain resources I an not convinced that it would work or offer the full flavor of features.