OS X to OS X Server Upgrade


I am planning on upgrading a B&W G3 to X Server to regain the file sharing abilities lost in (left out of) X. Does anyone know if I can install X Server over X without loosing my applications, files, settings, etc...?

Or will I have to wipe the partition X resides on prior to installing X Server?
Just [don't] do it, or you'll be sorry forever. Backup you current data, install OSX server, put the data back on.