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By default, the certificate that installed with Exchange Server 2010 is self-signed.

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Otherwise, make sure that this computer can access the revocation server.

If there is a firewall or proxy server in between this computer and the revocation server, make sure that your computer is configured to traverse the obstacle.

An end-entity certificate is a certificate that has been created for specific application cryptographic usage.

Generate a new certificate by using the New-Exchange Certificate cmdlet, or contact your certification authority to validate the certificate.

This status message indicates that the revocation server for the certificate could not be reached.