Masken, I'm sorry, but since I have no experience with ISA (yet), I cannot really see the benefits with integrating it with the AD. In my current opinion a firewall should stay a bit back from other structural things in the lan, since it can be proven to be a security-issue later on (somehow, perhaps I am totally wrong).
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as long as it works - why fix it?
If it doesn't work - kix-it!
