IE really doesn't support this. For any real testing, you want a separate virtual machine for each version of IE. This was discussed; see wayne's comment, which

IE really doesn't support this. For any real testing, you want a separate virtual machine for each version of IE. This was discussed; see wayne's comment, which links to Microsoft-provided VM images: http://news.ycombinator.com/item?id=353129 http://news.ycombinator.com/item?id=353129