[Evolution] Linux hardware question

[Jimmy Montague <rhetoric101 hughes net>]

I have a perfectly good, empty, XT case laying around here. It even has 
a new power supply in it. So I want to ask a couple of questions of the 
group.

1) how much computing power do I need to build a linux firewall that 
will service a LAN with five other (mostly windoze) computers on it? 
Notice I'm talking hardware only here. I don't yet know enough to ask 
software and networking questions.

Thanks for any advice.

Jimmy

Oh, and by the bye: I went and bought a fastmail account. Evolution now 
works PERFECTLY on Ubuntu 14.04. It's sleek fast, beautiful, and 
remembers everthing I tell it for four hours now, and counting. Thank 
you very much and I'm sorry to be a pill.

Jimmy again