I need a server for a small company with about 20 people. The server will be used as a fileserver for many MS Office files simultaneously. I tried to look at complete servers but I don't like any of the ones I've looked at. They require you to buy HDDs and an OS, which adds about 300 (currency unknown) more than I want to pay.
The server is for Windows but i already own a license and have a CD.
Is there real economy if I build it and can someone estimate what hardware I need for this kind of server?