Control External Access to Users

To provide privacy for your Instant Messaging users and servers, you may need to designate which groups of users and servers can access an Instant Messaging user's presence information and send messages to that user.

To control external access to users:

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, select the Windows 2000 domain in which you want to protect Instant Messaging users, and then click Users.
3. In the details pane, right-click a user name, and then click Properties.
4. Click the Exchange Features tab.
5. Click Instant Messaging, and then click Properties.
6. On the Privacy tab, select one of the following privacy settings:
7. • Allow access only from these servers and users
   • Allow access by all servers and users except
8. Click Add.
9. Type the Instant Messaging URL or server name. For example, to block a user with the Instant Messaging Address "someone@microsoft.com," enter the following URL: "http://im.microsoft.com/instmsg/aliases/someone."
10. Repeat the previous two steps for each user address and server name.