IE6 and IE7 Side By Side
For quite some time, developers have been asking us how to run Internet Explorer 6 and Internet Explorer 7 side by side, and sadly, it's not possible to it accurately. There is a work around that a few people have found, but it doesn't give you a true IE6 vs IE7 comparison. It's not just a matter of replacing a few files, you're changing core operating system components. And when you start doing that, you can get yourself into some potentially dangerous (crashing) situations. That's why it's not a sanctioned way of doing it. The way we've recommended for some time is to download Virtual PC (which is not free), and install Windows XP on it, and run IE6 there, and run IE7 on your main computer. Setting up a Windows XP box is time consuming, and
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Read the complete post at http://blogs.msdn.com/petel/archive/2006/11/20/ie6-and-ie7-side-by-side.aspx