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 From:  Raylund Lai <raylund dot lai at kankanwoo dot com>
 To:  m0n0wall at lists dot m0n0 dot ch
 Subject:  blocking msn messenger
 Date:  Mon, 06 Jun 2005 17:35:53 -0400
This link may be useful.  http://support.microsoft.com/kb/889829
The article is basically blocking:
1.    Block outbound access to TCP port 1863.
2.    Block HTTP access to messenger.hotmail.com.

Cheers
Raylund