IMAP/POP Certificate issue after Install of Ex2013 CU3

Scenario: After the installation​ of Ex2013 CU3, the certificate that was assigned the POP and IMAP services became unassigned and assigned to another certificate.  The error clients were receiving:
“IMAP Error: Server Certificate was rejected by the verifier because the certificate’s common name ‘’ does not match the hostname ‘’.
Resolution:  From Ex2013 Management Shell, run the following: 
1. Determine the thumbprint of the certificate that should have IMAP and POP enabled by running: Get-ExchangeCertificate 
2. Then run: Enable-ExchangeCertificate -Thumbprint XXXXXXXXXX -Services POP,IMAP
3. Restart the Imap and Pop frontend and backend services.

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