Hide Membership of a Mail-Enabled Group

By default, the members of a mail-enabled group are visible to Microsoft Outlook users in the group's Properties tab. However, you can hide the membership of a group using the Exchange Task Wizard.

Note   The following is the only supported method for hiding the membership of a group.

To hide the membership of a group

1. Start Active Directory Users and Computers
   On the Start menu, point to Programs, point to Administrative Tools, and then click Active Directory Users and Computers.
2. In the console tree, expand the Windows 2000 domain. Double-click Users, or double-click the node that contains the recipient information you want to modify.
3. In the details pane, right-click the group for which you want to hide membership, and then click Exchange Tasks.
4. On the Welcome to the Exchange Task Wizard screen, click Next.
5. Select Hide Membership, and then click Next.

Note   After you hide the membership of a group, you cannot modify the group's security properties. When a group's membership is hidden, its access control list (ACL) stores entries in non-canonical order. Although this format allows Exchange 2000 servers to expand group membership for message delivery, it prevents any modifications to the group's security properties. The following message will appear if you open the group's properties and click the Security tab:

Windows can not edit the permissions on 
group name because they have been written 
in a nonstandard format by another application. 
To enable editing, you must use the application 
to restore the permissions to a standard format.

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