I have been using a Tyan Tiger T200 board with dual P3 Tualatin (1.26
GHz) as a small office server for the past 2 years. It handles the needs
of ~20 concurrent users nicely. The built-in RAID capability has proven
reliable so far. The board is quite cost-effective with its integrated
video, audio, network, and RAID components.
MS SBS 2000 is the system software installed and handles e-mail
(Exchange 2000 Server), security (ISA 2000 Server), database (SQL 2000
Server), and file/print needs (Windows 2000 Server).
[This followup was posted to alt.comp.hardware.pc-homebuilt and a copy
was sent to the cited author.]