Active Directory processing changes takes a long time on an Office Communications Server 2007 R2 Group Chat Server

When you make some changes in Microsoft Office Communications Server 2007 R2 Group Chat Server, it takes a long time to process the changes.
For example, you add many users to a Microsoft Office Communications Server 2007 R2 Group Chat Server. However, the Active Directory process changes takes a long time.

Processing the differences in channels is managed by Active Directory groups with a very large membership. Therefore, the change in the Active Directory process takes a long time.

To fix this problem, install the following update:

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.