Multiple Versions of IE Simultaneously
Joe Maddalone of Insert Title Web Designs has found a way to run different versions of Internet Explorer on the same installation of Windows (XP and 2000). No more rebooting to a second Windows installation, no more second computer, no more VMWare virtual machines; this is the time-saving measure web builders have wanted for so long.
I tried the method on IE 4.01 SP2 and was unable to get it to work. I've got it working with 5.01 SP2 and 5.5 SP2, both of which work great. I suspect the method only works on the 5.0 codebase and newer.
via Branchleft