Just a quick one, I think I know the answer. I can't find any specs on the Apple site showing what the requirements for 10.3 Server are, will it run on a 640Mb G4 Cube?
System requirements are towards the bottom of the OS X Server Tech Specs page. It looks like any G3, G4, or G5 with at least 128 or 256 MB RAM should suffice.
Actually, you can't do it. I was running 10.2 server on a Cube, and had all kinds of problems when I updated to 10.3. I'm not sure where I found it on the Apple site, but the cube was not listed as a supported device anymore.
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That said, I did have 10.3 Server on my Cube at one point.