Microsoft Office Communicator Web Access (2007 R2 release) enables you to provide Office Communications Server services – such as instant messaging (IM), presence, audio conferencing, and desktop sharing – to users who do not use Office Communicator.

Communicator Web Access can be deployed on a single, dedicated server. A single Communicator Web Access server can handle approximately 5,000 simultaneous users. This assumes that the server meets the minimum hardware requirements and that the users are only engaged in instant messaging.

Communicator Web Access can be configured to handle service requests from three different types of users:

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