Hi KS82,
According to your description, you need to add 4 users to a group and let others can send IM to the group.
For this, you could create a distribution list in AD and add the 4 members in the distribution list. If others need to send IM to the group, they only need to search the distribution list in the OCS or add the distribution list to OCS contact list, then they
could chat with the 4 members in a group. You could refer to the following KB to find the details about
How Do I Add A Distribution List To OCS Contact List?
Best Regards,
Evan Jiang
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