Well I'm kinda stumped on this one.
But here are a few more tips.
First, sometimes testing the favicon from the local machine does not work in IE so upload to server and test.
Second, be sure to completely clear your Temp Internet Files folder, between tests or you may have a leftover, none working version.
To test yur icon I created a simple html page here:
View the source code and you'll see two favicons listed, currently yours is commented out. Test the code, but be sure to clear your cache before every test.
The CI icon appears. But when I comment out the CI code and uncomment your icon, no luck.....
However, by downloading your favicon directly at:
This now puts a copy of the ico in the Temp Internet Files folder. Then the browser backarrow to the test page and with your icon now in the Temp files folder, it displays correctly on the page.
The how and why it is such a problem.... beats the heck out of me...!!! There must be more rules on how IE handles the favicon that I can't figure out...
Good luck anyway!