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A certificate authority (CA)

The CA can be either Microsoft Certificate Services or a third party CA. The Live Communications Server must trust the certificate authority and have its own certificate installed.

Microsoft LCS and OCS integrations that use a server pool and load balancers require a Microsoft 2003 or 2008 Enterprise Edition CA.

noteNote

Windows 2003 or 2008 Server Standard Edition comes with a Standard Edition CA. However, Microsoft Standard Edition CAs are not supported. The Enterprise Edition CA is only included in Windows 2003 or 2008 Server Enterprise Edition.