Enterprise Vault Support statement for Netscaler firewalls

Hi

Is there any kind of support matrix for Enterprise Vault working with different vendor firewalls? The EV compatibility guide shows MS ISA and Forefront TMG as being supported but I assume that other vendor firewalls should work and customer won't be refused support if using other solutions.

So my question is simply can a customer use any vendor firewall within an EV environment (I'm talking about OWA and Outlook Anywhere EV solutions through the firewall) without finding themselves with an unsupported solution or is there a compatibility guide I should be referencing?

This requirement is specifically for a Citrix Netscaler environment which I'm sure many customers must be using successfully with EV.....

thanks