Nearly 10 years after it's release Internet Explorer 6 is still used by enough people to warrant testing. But as IE is now a Windows Update you cant keep an older copy around for testing.

OR CAN YOU?!

The IE Collection (http://finalbuilds.edskes.net/iecollection.htm) allows you to install any copy as far back as 1.0 and run it in parallel with IE 8+.

Internet Explorer Collection contains the following versions of IE:

• Internet Explorer 1.0 (4.40.308)
• Internet Explorer 1.5 (0.1.0.10)
• Internet Explorer 2.01 (2.01.046)
• Internet Explorer 3.0 (3.0.1152)
• Internet Explorer 3.01 (3.01.2723)
• Internet Explorer 3.03 (3.03.2925)
• Internet Explorer 4.01 (4.72.3110.0)
• Internet Explorer 5.01 (5.00.3314.2100)
• Internet Explorer 5.5 (5.51.4807.2300)
• Internet Explorer 6.0 (6.00.2800.1106)
• Internet Explorer 6.0 (6.00.2900.2180)
• Internet Explorer 7.0 (7.00.5730.13)
• Internet Explorer 8.0 (8.00.6001.18702)

For those of us who require functional testing in IE over older versions, this is an excellent tool....until IE is standards compliant