To install Office Communications Server Group Chat Server, you
must have a certificate issued by the same CA as the one used by
Office Communications Server 2007 R2 internal servers for each
server running Lookup service, Channel service, and Web service.
Make sure that you have the required certificate(s) before you
start the Group Chat installation, especially if you are using an
external CA. For details, see
Obtaining Certificates for Group Chat
Serverin Deploying Group Chat Server in the Deploying
Office Communications Server 2007 R2 for Internal User
Access documentation.
