Password Protected Page Won’t Open in IE6

Had a question re: the password-protect option in WordPress. I created a site for a client, and password-protected one of the pages. However, I’ve heard from him that many of the people with his organization (who are using IE6 as their browser) can’t access the page. It works fine in Firefox, Flock….I’ve logged in just fine using Safari and Firefox on my Mac – was wondering if anyone had experienced problems like this in the past?

Would love any advice you all could share with me – thanks a lot.