Enterprise allows clustering, Standard does not. ie: With Enterprise you can have multiple ISA Servers all working together to handle a larger workload or for redundancy (this also means that it stores everthing in Active Directory), ISA is one server.
The only other difference that I can think of is $$$cost$$$.
How about with regard to rule processing? Here's my situation. I have 2 ISA Standard servers. My users currently use one for the main internet connection. If the line fails on that server, I want to be able to automatically point to the other server, which sits in another segment in another physical location. Here's the problem. When I setup the rules (one for normal routing which retrieve requests directly from the internet, and the default/last rule is set to pull from the upstream server - in this case that second server). However, if I test this (by disconnecting the main server's internet connection), the rules do not process automatically. I have to manually go in and disable the normal routing rule, then restart the ISA Services and tell all my users to logout/login before they can access the internet again. Then, if the lone comes back up, I have to reverse the process, and actually reboot the ISA server ('cause restarting the services doesn't work for some reason in this case).
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