1. In Exchange System Manager, click the virtual server that you want to configure.
2. On the Action menu, click Properties.
3. Click the Access tab, and then click Authentication.
4. Click any combination of Allow anonymous, Basic authentication, Windows Security Package, or Enable SSL client authentication.

   NOTE: If you use basic authentication, passwords are transmitted in clear text. A certificate is required to enable Secure Sockets Layer (SSL) client authentication.
   If you click Allow anonymous, type the account that will be used to gain access to resources when an anonymous connection is made.

5. Click OK, and then click OK again to close the virtual server properties.

The information in this article applies to:

• Microsoft Exchange 2000 Server