From a reply by Dian Poremsky to a post asking the SAME question early
this morning.
This is a problem with IE, its not an Outlook error. You need to reset
your internet settings in IE's Tools, Internet Options, Advanced tab.
(Or Control panel, Internet options, Advanced tab).
See http://www.slipstick.com/problems/link_restrict.htm for the latest
information.
Did you do ANY searching before posting? Google would have given you
THOUSANDS of the very same question with answers.