AQUILLES10 I just installed Sharepoints on an older G4 400mhz Powermac running Mac OS 10.3.9 and couldn't be more happy. The program is relatively easy to set-up, and very stable. If all you need from your server is simple file sharing, then Sharepoints pretty much is all you need and makes OS X server software overkill. And to top it all of, you cannot beat the price!
(Version 3.5.4)