webaj did you post your digicert instructions anywhere yet?
I have a *.domain.com wildcart cert as well, currently working for my webserver at
www.domain.com. I copied the domain.com.crt , domain.com.key and DigiCert.crt file to the zimbra server to /opt/zimbra/ssl/zimbra/commercial/
I ran
./zmcertmgr deploycrt comm /opt/zimbra/ssl/zimbra/commercial/domain.com.crt /opt/zimbra/ssl/zimbra/commercial/DigiCertCA.crt
but it complained about there being no commercial.key so i renamed my domain.com.key file to commercial.key and reran the command but now I get
** Verifying /opt/zimbra/ssl/zimbra/commercial/domain.com.crt against /opt/zimbra/ssl/zimbra/commercial/commercial.key
Certificate (/opt/zimbra/ssl/zimbra/commercial/domain.com.crt) and private key (/opt/zimbra/ssl/zimbra/commercial/commercial.key) match.
XXXXX ERROR: Invalid Certificate: /opt/zimbra/ssl/zimbra/commercial/domain.com.crt: /C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert Global CA
error 2 at 1 depth lookup:unable to get issuer certificate
XXXXX ERROR: provided cert isn't valid.
I agree a bit with the complicated part. I consider myself pretty brave but a lot of the wiki's involve doing things I'm afraid I'd be unable to undo if something went wrong.