I recently saw a thread about this but just wanted to make sure of a couple things. I have a virtual dedi hosting plan with CentOS4 and Plesk 8.2.1 (I think). CentOS4 has php 4.3.7, which I want to upgrade to php5. This means I will probably also be upgrading MySQL. I can find guides on how to do it, but I just want to make sure that I will not break Plesk. Will upgrading PHP and MySQL break Plesk at all, or are the only issues I will have to work with and worry about be general and related for servers with / without Plesk (such as runtime errors from the new version of PHP5, or other general problems that can arise). I'm just not sure how control panels work or how they are integrated with the rest of the server. I'd like to upgrade, but I can't afford to break anything. Thanks.