OCS certificate

Hi All,
Cam someone explain to me how the certificate works on OCS and on the client side?  We have OCS2007 don't know if it is enterprise or standard.  However the SIP is under the Enterprise pools.  When I click on Certificate and select certificate I get buch of issued to certificates that are not valid.   There is only one that is valid and it is issued by Entrust Certifcation Authority.  
Are we also suppose to have the certificate loaded on the clients machines?
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I recommend reading through the OCS Certificates White Paper release by Microsoft.  X.509 certificates usage by OCS for TLS/MTLS is a pretty extension topic and without a basic grasp of the technology it's hard to both describe the functionality and troubleshoot problems.

If the Pool object appears in the OCS Management Consols under the Enterprise object then you have an Enterprise Edition Front-End Server deployment.

If a valid Entrust certificate was configured on the Front-End server than the clients should already trust them as the Windows OS will be preconfigured with Entrust's root/issuing CA certificates in their trusted stores.

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