>Thanks for your quick reply. I have looked at it but am not sure if I have the necessary equipment for it. One of the things that I like about Linux is that you can run it on modest equipment.
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>I am looking at running a server with PIII500 and 128 mb ram. Do you know how MS SBS 2003 would run on this? I obviously don't want to spend money on both a new server and the software if i can get away with out doing it.

For your situation I'd look hard at SBS 2003. Not long ago I was following a thread on (I think) SlashDot asking about Exchange replacements. While there was some moaning about susceptibility to viruses and the fact that it's from the "Evil Empire" (SlashDot is open-source / *n?x-oriented) the consensus was that the combination of Outlook and Exchange is a strong product.

If you're going the SBS route boost the server RAM up to 512MB at least - RAM's incredibly cheap.

I think the SlashDot link was http://slashdot.org/article.pl?sid=03/07/10/1240242&mode=thread&tid=185 . Interesting reading.