I've watched the CBTs on this topic, and am a little familiar with the baseline concepts in dealing with ISA Server. Unfortunately, I'm not seeing information for my particular scenario - which leads me to believe that it's not possible.
What I'd like to do, is the following (very crude example):
ISP <-- Router <-- PLACE ISA SERVER HERE <-- Internal L3 Switch <-- Multiple Subnets
In this scenario, I already have all my address space defined, and I'm not wanting to be bothered with changing any of it... But I'd like to drop the ISA server in the network where I said - as a transparent bridge.
If it can, then of course provide a firewall, WebCache, ContentFiltering, etc. As I wouldn't be doing any NAT in this topology scenario, I'm almost certain that I couldn't do any of the items I mentioned.
But if anybody else has any information, please don't hessitate to share.
As always - thanks for helping.