...unless the old box hapens to be a P2 300 running Win 98SE. Not too much one can do with that.
I use my 486 to take up shelf space and to slowly collect layers of dust as a historical record.
I Freep from a machine with specs not much higher than that....K6-3 450 mhz, running WinME. You'd be surprised just how stable it is for browsing, email, mp3s and acting as a gateway and firewall. It's not gonna win any speed records anymore, but it's rock solid.