You are confused...
Apache latest version is 2.2.3 (
http://httpd.apache.org/) But most servers still use the previous configuration... ( 1.3.37 ).
You are referring to mySql ...
If you go with the 5.0 + versions, some scripts could ( but maybe not ) stop functionning as they should. Why do you want to upgrade ?
If you do decide to upgrade, read BEFORE to find out what issues could affect your scripts and what are the fixes.
But if it does the job now, keep it that way...
