Thanks to Microsoft, it's been impossible in the past to install two different versions of Internet Explorer in Windows. Whenever a new one is installed, the older version is deleted. Good for end-users, but bad for us. We need the ability to test our sites on multiple browsers to ensure uniformity. Because of the IE multiple install problem, we have to maintain a separate test computer just to be able to access IE 6 for testing.

Our own black sheep Shawn came through with a resource he stumbled across that would solve this problem. The MultipleIE installer takes advantage of a DLL exploit in Windows (imagine that!) to allow installation of IE 3, 4.01, 5, 5.5, and 6! Not bad!