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Office Communications Server 2007 R2 requires a public key infrastructure (PKI) to support TLS and mutual TLS (MTLS) connections. By default, Office Communications Server 2007 R2 is configured to use TLS for client-to-server connections.

Office Communications Server uses certificates for the following purposes:

• TLS connections between client and server
  
  
• MTLS connections between servers
  
  
• Federation using automatic DNS discovery of partners
  
  
• Remote user access for instant messaging (IM)
  
  
• External user access to A/V sessions, application sharing, and Web conferencing
  
  

For Office Communications Server 2007 R2, the following common requirements apply:

• All server certificates must support server authorization (Server EKU).
  
  
• All server certificates must contain a CRL Distribution Point (CDP).
  
  
• Auto-enrollment is supported for internal Office Communications Server servers.
  
  
• Auto-enrollment is not supported for Office Communications Server Edge Servers.
  
  

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