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Originally Posted by jtwn
I thought it used that port, another and would fail to port 8 if needs be.
You got to remember, there is still msn webmessenger they can use.
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Blocking HTTP connections to messenger.msn.com (and presumably messenger.msn.co.uk - although I don't have access to our firewall to reconfigure it, so can't check) will block access to MSN web messenger.
The article Paul has a link to does say how to block both MSN Messenger and MSN Web Messenger.