I get this message from a site I visit/use daily, when using IE6 and after using their forms/links and hitting back:
Warning: Page has Expired The page you requested was created using information you submitted in a form. This page is no longer available. As a security precaution, Internet Explorer does not automatically resubmit your information for you.
To resubmit your information and view this Web page, click the Refresh button.
But I don't get it when using Netscape. I never use to get it when using IE6 until about a week ago. I understand about posting the data etc. But don't understand why it would only start happening now and why NN wouldn't do the same thing? The pages are ASP pages.