Control Access to the HTTP Virtual Server
HTTP virtual servers allow you to support a collaborative authoring environment. When you collaborate on confidential material, it is important to control who has access to the data; however, if you also want users outside of your organization to access public information, you can enable anonymous connections on a separate HTTP virtual server. To restrict user access you can use the following procedures on the Exchange virtual server, or you can use IIS to set security features.
To control access to the server: