Cannot connect Office Communicator 2007 R2 to Office Communications Server 2007

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Summary:

You cannot connect to an Office Communications Server 2007 using an Office Communicator 2007 R2 client.

Details:

There are architectural changes introduced into Office Communicator 2007 R2 that are only compatible with Office Communications Server 2007 R2.

Workaround:

On Office Communications Server 2007, you can select to block Office Communicator 2007 R2 clients from connecting.