Please update Internet Explorer\!
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Update September 24: Microsoft released an update for Internet Explorer. We urge you to install this update before using Internet Explorer to browse the Internet.
September 19: Due to a new vulnerability in Internet Explorer (versions 6 through 9,it is advised not to use Internet Explorer to browse the Internet. Visiting not-contaminated websites within ru.nl of course is still possible. Use an alternative like Google Chrome or Mozilla Firefox. Without installation one can use Firefox Portable.