Plesk 9.5.x and PCI Compliance
How to - PCI compliance for Plesk 9.5.x
Achieving PCI compliance is not an easy feat but Plesk has made things a bit easier with a nice utility that sets common security features rather than performing the steps manually.
Please follow this link to the Plesk PCI compliance document -
Once you have enabled the PCI measures from the above document, you may want to replace the default, self-signed SSL certificates for services such as secure IMAP, POP3 and SMTP. The following document can help with this as well -