MSN Messenger

[=?windows-874?q?=CD=C0=D4=CA=D4=B7=B8=D4=EC__=CA=D8=A2=CA=D2=A4=C3?=]

Dear all,

        I have found that some users in my company use MSN Messenger running
through http port. Is it a good idea to use this one? 
If it has security problems, how can I block it?

Thanks.
apisit.
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