Web Service Security and Pre-Authentication with ISA 2004http://blogs.technet.com/accessdenied/pages/420744.aspxI have written about ISA 2004 as an application layer firewall and gateway and how it is designed to help secure access to a variety of services – including providing secure external access to collaborative/mobile services like Exchange, SharePoint anden-USCommunityServer 2.1 SP1 (Build: 61025.2)