From Microsoft
If you encounter a site which does not recognize Internet Explorer 7, a new tool known as the User Agent String Utility has been created to help you work around the problem. The utility comes in the form of a small executable that opens an Internet Explorer 7 instance that emulates Internet Explorer 6 by sending the Internet Explorer 6 user agent string. It also provides a mechanism for you to report problem web sites to Microsoft so that we can follow up with the affected site owners.
Download the tool here.
