The default location for the SSL certificates, CSR etc is in /etc/httpd/conf/ssl.crt/server.crt, /etc/httpd/conf/ssl.csr/server.csr
OpenSSL-0.9.8d is installed as part of the
IMAP server installation. Follow
these instructions to generate your own, unique CSR, or you can simply use the one created when you installed the
IMAP Server. I believe that Westhost use your account password as the passphrase, but I would check with tech support before accepting that as gospel.