ARGH: Large WebDAV PROPPATCH requests fail with 401/401.5

I had a case recently where one of our products, Duet, was doing a large PROPPATCH against Exchange 2003 and it was failing with a HTTP 401 error. The customer noticed that small PROPPATCH requests succeeded, but large ones (bigger than say 25 KB) would fail. Well, we knew that it couldn’t be a permission problem,…


Request Handler Installation Problems

Sandeep has posted a blog about Request Handler Installation problems I would just add that an additional thing to check is that the user you are entering has an SMTP address (whether primary or secondary) that matches the domain for the Exchange virtual directory in IIS. So if your Exchange virtual directory points to…


Duet Planning Guide

By far the best reference documentation available on Duet that I’ve found…[I may change my mind later 😉 ]  


Doin’ Duet

I’ve been tasked with creating support training for a new product we have called Duet. What is Duet? I had the same question myself when I was told that our teams (the Enterprise Business Apps Messaging Development support team and the Visual Studio Office Development support team) would be responsible for supporting it. Duet is a joint…