Walkthrough: Enable distribution group support

To enable distribution group support

1. Log on to a computer running the Office Communications Server administrative tools. To enable distribution group support you must be a member of both the Domain Administrators group and the RTCUniversalServerAdmins group.
2. Click Start, point to Administrative Tools, and then click Office Communications Server 2007 R2.
3. In the console tree, expand the forest node.
4. Expand Standard Edition Servers and right-click the name of the server on which Communicator Web Access is installed.
5. Click Properties and then click Web Component Properties.
6. In the Web Components Properties dialog box, on the Address Book tab, verify that Enable distribution groups expansion has been selected, and that the desired value has been entered in the Maximum group size box.
7. Make any changes as needed, and then click OK.