Some time ago, I had the time and tools to verify and assemble a three-part article that outlined RPC over HTTP protocol (AKA "Outlook Anywhere") across a WAF (ISA Server, in this case) behavior and detailed testing methodology.
Based on what I see in this message board, these articles may help demystify this traffic and provide some testing tools that free you from the Outlook client itself.
Part 1: Testing RPC over HTTP through ISA Server 2006 Part 1; Protocols, Authentication and Processing - Forefront TMG Product Team Blog - Site Home - TechNet Blogs
Part 2: Testing RPC over HTTP through ISA Server 2006 Part 2; Test Tools and Strategies - Forefront TMG Product Team Blog - Site Home - TechNet Blogs
Part 3: Testing RPC over HTTP through ISA Server 2006 Part 3; Common Failures and Resolutions - Forefront TMG Product Team Blog - Site Home - TechNet Blogs
HTH,
Jim
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