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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Stephen MandersonSoftware EngineerCommented:
You could try to block the HTTP headers for the yahoo message service.

You can find the signature here;
http://technet.microsoft.com/en-gb/library/cc302520.aspx

There is also a link there on how to apply the filter aswell.

Does the integrated messenger service require any licks to be clicked that result in a specific sub domain being accessed? If so you could also block that url from being accessed.
http://www.isaserver.org/articles/2004firewallblocklist.html

Regards
Steve
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