To prevent instant messaging users from joining an IM group, or to allow banned members to join it, open IM. Scroll to Conversations and select Expand. Scroll to an IM group and select Options > Group > Settings > Banned list > Selected users.

To prevent instant messaging users from joining an IM group, or to allow banned members to join it, open IM. Scroll to the Conversations folder and select Expand. Scroll to an IM group and select Options > Group > Settings > Banned list > Selected users.

You can edit IM group settings only if you have editing rights for the group.

Select Options and from the following:

The available options may vary.