On the Start menu, point to
Programs, point to Microsoft Exchange, and then click
System Manager.
Navigate to the
Channels folder for the chat community where you want to
restrict channel access.
Chat Communities
Chat_community_name
Channels
Click the Channels folder.
In the Details pane, right-click the channel to be restricted,
and then click Properties, or create a registered channel.
On the channel's Access tab, under Allow only,
select the Invited users check box.
Note Users who want to join
an invitation-only channel must be explicitly invited. The channel
owner or meeting leader uses the following command from a chat
client to invite each participant: