Eric,
You can connect NT systems together with little problem, using ethernet network cards with twisted pair cables and a hub. The only expense is the NT operating systems. NT also has a personal web server, so you can have your own Intranet. For your email and website, you may want to pay $20/month and go with a web hosting service.
Also Linux is free with apache web server which is also free, and I hear they have gone leaps from the older difficult installations. Windows machines should be able to hook into them via ethernet and hub also.
Hope that gives you a general idea, Cliff
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