Got my server in 2004 and have never updated anything.

Still on Plesk for windows v6.5.2, mySQL v4.0.16 & php v4.33

My questions..


1. I'm more concerned about updating mySQL and php.
a) Can I do this without updating plesk? They seem to be installed as part of it (in the SWSoft folder)
B) Is it easy? Should I get Planet support to do it?
c) Will my licence key be valid for the updated version?

2a) Should I update Plesk? I never use it. In fact I think it's pants.
B) If I do, how much will Planet support charge to do this?