Using ISA to block instant messenger attachments

Is it possible to configure ISA (without using a 3rd party product) to block
attachments sent using an Instant Messenger (MSN, Yahoo, AOL, etc)? I
imagine it would be done with a site and content rule.

Bob

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1 23rd July 03:09 bob External User Posts: 1	Using ISA to block instant messenger attachments Is it possible to configure ISA (without using a 3rd party product) to block attachments sent using an Instant Messenger (MSN, Yahoo, AOL, etc)? I imagine it would be done with a site and content rule. Bob