[This is pre-release documentation and subject to change in future releases. This topic's current status is: Milestone-Ready]

Topic Last Modified: 2010-07-15

In this documentation, we use the term external user to refer to a user who signs in to your Microsoft Communications Server 2010 deployment from outside the firewall. External users that you can authorize to use Communications Server to communicate with internal users can include the following:

Your edge deployment authenticates such users and controls external access for the following types of communication:

In order to control communications across the firewall, you can create global policies that define how users inside and outside your firewall communicate with each other. You can also configure settings and create and apply policies for individual internal users or for specific types of external users to control communications with external users. For example, you can allow users in federated domains to access IM and presence but not A/V conferencing or Web conferencing.