XP On 8-MHz Pentium With 20 MB RAM 410
swehack writes "The guys over at winhistory.de managed to get their Windows XP Professional running on a very minimal box: an Intel Pentium clocked down to 8 MHz with 20 MB of RAM. (The installer won't work with less than 64 MB, but after installing you can remove memory.) The link has plenty of pictures of their progress in achieving this dubious milestone. They deserve a Golden Hourglass award for 'extreme waste of time.' What obscure hardware configurations have you managed to get Windows running on?"