I just purchased a GoDaddy certificate. I first generated the csr using the zimbra admin interface. I used that file to generate the crt from godaddy. I tried to install the cert using the crt for my server, the intermediate crt, and what i believe to be the godaddy root crt.
When it tried to install the certificate, I got this error.
Your certificate was not installed due to the error : system failure: XXXXX ERROR: Unmatching certificate (/opt/zimbra/mailboxd/webapps/zimbraAdmin/tmp/current.crt) and private key (/opt/zimbra/mailboxd/webapps/zimbraAdmin/tmp/current_comm.key) pair.