Not nearly as low-end, but I ran a server off of a P3 450MHz for over a decade, then sold it to someone who was going to continue using it for a similar purpose. 4 of those years were in a college dorm room with no A/C.

The CPU fan died at some point, and I didn't notice until I opened it up to change a hard-drive. If it's not still running it's probably due to an exploded capacitor, because that thing was indestructible.