Currently there is no equivalent to dispatch groups found in Repartee/Replay Plus in the Unity product. It's a little tricker since we're using the Exchange directory and message store and we don't have the ability to "revoke" a sent message as we do in Repartee (which is more or less how dispatch messages are handled in Repartee).
This request comes up from time to time and would be handy to have, if somewhat sticky to implement.
As always, make sure you send feature requets like this to "Features@ActiveVoice.com" so the marketing guys driving the feature lists know you guys need this stuff.
Jeff Lindborg
Unity Product Architect
Active Voice Corp
jlindborg@activevoice.com
