Take one old office server.
Remove old Pentium II 250MHz processor.
Strip from old teaching PCs a couple of ethernet cards, CDROM, a Pentium III 450MHz and some memory.
Add old 18GB UltraSCSI external hard drive.
Mix together well and add MandrakeLinux 10.0 Official.
Garnish with Apache2 and sprinkle liberally with SquirrelMail and iptables.
Bake at sysadmin mark 7 for 5 hours.
The result is a new webmail server, NAT gateway and logging telnet server.