Article ID: 945542 - View products that this article applies to.
Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows
When you send an instant message (IM) to a distribution group that contains more than 100 users in Microsoft Office Communicator 2007, you receive the following error message:
<GroupName> is too large to display. Communicator cannot be used for groups with more than 100 members.
This problem occurs because Communicator 2007 has a limit of 100 members in a distribution group. Additionally, Communicator 2007 has a limit 100 attendees for a conference.
Hotfix informationTo resolve this problem, apply the Communicator 2007 hotfix package that is dated December 7, 2007. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
943083Note After you enable the hotfix, the limit is increased from 100 to 150.
(http://support.microsoft.com/kb/943083/ )Description of the Communicator 2007 hotfix package: December 7, 2007
Registry informationWarning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
To enable the hotfix, you must change the registry. The changes to the registry can be made through a Group Policy object (GPO).
To make the changes to the registry manually, follow these steps:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.