Microsoft to Require 64-bit Processors
Nom du Keyboard writes "According to News.com Microsoft has said they will require 64-bit instruction set processors (AMD64/EMT64) for all future processor releases. These include Exchange 12, Longhorn Server R2 and Small-Business Edition Longhorn Server among others. I guess we have to bite this bullet sometime."
FYI the Commodore 64 was called such because it had 64kB of memory. That said, there's no excuse for not using the old girl to try and bluescreen Longhorn!
May the Maths Be with you!