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I'm not totally sure but perhaps IE requires some sort of required format? For testing purposes, use this code to set a cookie (taken from w3schools' website),

function...

Add in the action attribute to the form tag specifying the thank you page.

http://www.i18nguy.com/markup/metatags.html

Check out the CACHE-CONTROL tag name. Be sure to read the description because it has important info.