This article outlines some of the features in the new version of Exchange. There is also a brief mention of its interoperability with AD RMS.
Using the Transport Protection Rules, it was possible within the administration interface to create customized rules to control how specific messages could be routed within an organization—for example, applying “no forwarding” rules to specific messages. This feature could also be tied to Windows Rights Management Services to provide deeper DRM-style controls over some messages.
Recently, at the RSA Security Conference, we had a demo that showed how an administrator (with Exchange 2010 and AD RMS) can set rules for e-mail messages, such as "if this message is sent from a full-time employee to a vendor, do not allow forwarding." Customers received it positively.