Replacing a user certificate with a CA-signed certificate (server ID)
After you submit a CSR to a Certificate Authority (CA) and receive the CA-signed certificate back, you must replace the user certificate previously generated in Certificate Manager.
If the CA-signed certificate is sent embedded in an email, cut and paste the certificate
            into a certificate file. This involves copying from the -----BEGIN
               CERTIFICATE----- marker to the -----END CERTIFICATE-----
            marker (inclusive) into a text editor. The extension you give the certificate file does
            not really matter. Certificate Manager will automatically determine whether just one
            certificate (CER/DER) or a certificate chain (P7B) is included.  If a certificate chain
            is found, this means intermediate and/or root CA certificates have been included. These
            are imported, along with the CA-signed user certificate, into the proper stores.
