How to block with ISA 2006 yahoo chat integrated in Yahoo Mail?

How to block with ISA 2006  yahoo chat integrated in Yahoo Mail without totally blocking the Yahoo Mail?
usere3Asked:
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Ehab SalemConnect With a Mentor IT ManagerCommented:
Block traffic to *.msg.yahoo.com
and the IP range 98.136.112.1 - 98.136.113.254
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thabashCommented:
ehabsalem:

genius it blocked now in our company, loool no body will be able to use yahoo mail to chat any more
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