Originally posted by breun
If your OS version is EOL you might want to upgrade even though the system is still working. Are you really leaving systems directly connected to the internet as long as they work?
The extreme example here is Fedora Core. Fedora Core 1-4 are EOL right now, only Fedora Core 5 and newer receive security updates for packages like Apache, PHP and other critical software that Plesk 'borrows' from the distribution you're running. Plesk 8.1.0 still supports Fedora Core 1-4, but you would be running an unpatched system really. The sad part is that probably the majority doesn't even realise they're running an unpatched system.
Fedora is probably moving too fast for Plesk. People like the latest versions when they're installing, but get bitten by the short life spans of bleeding edge distributions.