New
#221
Not super old but I've got 7 Pro running pretty well on this:
Sony Vaio PCV-RX270DS Desktop
Pentium III EB 866mhz
512mb PC133
500GB ATA (upgrade, largest+fastest IDE I could find)
Nvidia 6200LE AGP 512mb (upgrade, Aero works, running 1920x1200)
Runs pretty well just for web stuff but I'm actually using this box as a security camera DVR. Not the oldest machine I have but its the oldest running 7.