I am using Plesk version 8.6.0 that has apache version 2.2.3. According to PCI DSS (Payment of Credit Card Industry Data Security Standard), I have to use apache version 2.2.11 or higher. If Plesk version 9.2.3 contains apache version 2.2.3, then I do not need to upgrade Plesk. Otherwise, I need to upgrade Plesk containning the latest compatible version of apache. That is why I am asking this question above?