Track messenger messages in ISA server?

As all of my internet traffic goes through an ISA server, is it possible to extract the content of IM messages from the logs?

It's ISA 2004 running on 2K3 Server.

Thanks in advance.

From serverfault Marko Carter

• Yes, see http://technet.microsoft.com/en-gb/library/cc722766.aspx

  Make sure you have plenty of free disk space though!

  JR

  Marko Carter : +1 for the link!
  From John Rennie