<A target="_blank" href="http://chris.brandlehner.at/Brandlehner/cab_blog.nsf/d6plinks/CBRR-7NRHWU">Christian Brandlehner upgraded his mail server</A> to 8.5 and suddenly had a lot of calls from his help desk about people unable to connect to their mail. He details his efforts to fix the problem. He's not certain it's fixed now, but users can again get into their mail.