I have a dedicated server that hosts a few active moodle 1.5.3 installs and several WordPress blogs. I currently run php 4.3.11 and MySql 4.0.27 on the server. I've been debating trying to upgrade to MySql 4.1.16 so that I could updrade some of my Moodle installs to 1.6.
What are my changes of completely messing up my current Moodle and WordPress installs if I do this? Any tips/suggestions would be appreciated.