Messenger pop-ups behind a firewall

From: Longhorn (eeeeeeeeeeeee_at_mooooooooooo.com)
Date: 10/07/03 

Date: Tue, 7 Oct 2003 08:55:52 -0400

This morning I had a messenger service pop-up sitting on my screen
advertising some low rate loans. I'm behind a firewall blocking ports
135-139 and 445 (the firewall really blocks those ports - I just checked).
How is that possible? 

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MCSECSMFC+