You do not have permission to create chat rooms in a Microsoft Lync 2010 Group Chat client. However, the Create a Chat Room command in the Connect menu is available in your Group Chat client. When you click the Create a chat room command, you receive the following error message:
You do not have permission to create a chat room. Please contact an administrator to request permission to create char rooms.
This issue occurs because only administrators have permission to create chat rooms.
To resolve this issue, install the following cumulative update:
2500446 Description of the cumulative update package for Lync 2010 Group Chat: April, 2011
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.