How to block Yahoo and MSN messenger using ISA Server 2004 Enterprise Edition?

How to block MSN and Yahoo messenger in a domain using ISA server 2004 Enterprise edition.? The way Microsoft describe to block i tried butt it didnt work.
aqesa_itAsked:
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Ahmed Abdel SalamPh.D. CandidateCommented:
you can block it using the application header signiture

http://www.microsoft.com/technet/isa/2004/plan/commonapplicationsignatures.mspx
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Nyah247Commented:
Even if you block it with the header signature clients can still access msn and yahoo messenger through their mail websites.  You will have to create a url block as well.

Check out this for additional info:

http://www.experts-exchange.com/Security/Q_21899381.html
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Computer101Commented:
Forced accept.

Computer101
EE Admin
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