Still get the same error.. I'm not at all sure where to go from here.
/opt/zimbra/bin/zmcertmgr deploycrt comm /opt/zimbra/ssl/zimbra/commercial/commercial.key /usr/local/src/CERTIFICATE_GODADDY/gd_bundle.crt
** Verifying /opt/zimbra/ssl/zimbra/commercial/commercial.key against /opt/zimbra/ssl/zimbra/commercial/commercial.key
unable to load certificate
17798:error:0906D06C:PEM routines:PEM_read_bio:no start line

em_lib.c:650:Expecting: TRUSTED CERTIFICATE
XXXXX ERROR: Unmatching certificate (/opt/zimbra/ssl/zimbra/commercial/commercial.key) and private key (/opt/zimbra/ssl/zimbra/commercial/commercial.key) pair.
XXXXX ERROR: provided cert isn't valid.