In Office Communications Server 2007 R2, you can enable group
expansion to allow users to send an instant message or a meeting
invitation to a distribution group in Active Directory.
Distribution group expansion enables users to invite all or
selected members of a distribution group to an instant messaging
(IM) conversation without having to search for and add each one
individually. To do so, Office Communications Server 2007 R2
accesses an Internet Information Services (IIS) server that hosts
the distribution group expansion service so that the group
membership can be expanded to individual users to whom meeting
invitations or instant messages are sent.
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