When you are configuring SSL certificates for Exchange Server 2013, after you have generated the certificate request and received the SSL certificate from the certificate authority, you then need to complete the pending certificate request.
In the Exchange Administration Center navigate to Servers -> Certificates. Choose the server you are configuring the SSL certificate for and highlight the certificate that has a status of “Pending request”.
Pending certificate request in Exchange 2013
With the pending request highlighted click on the link to Complete.
Choose to complete the pending request
Enter the UNC path to the certificate that you were issued by the certificate authority, and then click OK.
Provide the path to the certificate file
When the pending request is completed and you return to the main EAC window you will see the status has changed to “Valid”.
The SSL certificate is now valid
When the it is showing as valid you can then assign the SSL certificate to services on the Exchange 2013 server.
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