An update is available to disable the ability to add all members of a category as members of a chat room in Lync 2010 Group Chat
KB Article: http://support.microsoft.com/kb/2621837
This article describes
an update that is available for Microsoft Lync 2010 Group Chat clients. This
update disables the ability to add all members of a category to a chat room as
members. The following functionalities are updated:
- When a user creates a chat room in a Group Chat client, the Same as category category name option is disabled in the Initial Membership List page of the Create a Chat Room wizard.
- Assume that a user right-clicks the chat room, and then clicks Manage… . If the Create a new membership list option that is located under the Settings tab is selected, it cannot be deselected.