Exchange Server 2010 "The Certificate is Invalid for Exchange Server Usage" Error

This can occur when the certificate cannot be verified to a trusted certificate authority. To correct the problem you must install the root certificate for the certificate authority.

If you have received a .P7B file, the full certificate chain including root certificate is typically included. If you have received a .CER or .CRT file, you need to first import the other file(s) that have been delivered together with the SSL certificate, that might be called CA-Bundle or COMODORSAddTrustCA.crt, COMODORSADomainValidationSecureServerCA.crt etc. into the local certificate storage (computer account):

Launch a new Microsoft Management Console (Start -> Run, mmc.exe) and add the Certificates snap-in to it, connecting to the Computer Account for the Local Computer. Navigate to Trusted Root Certification Authorities.  Right-click on Certificates and choose All Tasks and then Import.

After you have imported both root and/or intermediate certificates, the error message should be gone.

You may find further details in this article:

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