EDIT 1/24/2008: Please see the Part 2 of this post which has additional information on how to resolve this problem.
After applying SP2 to an Exchange 2003 server, users may have problems updating Di...
Updated Jul 01, 2019
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Understanding multi-domain DL update and delegate issues after application of Exchange 2003 SP2
Thanks again, Mike, it is obvious we need some redesigning to be done. I guess "full topology" is a little overzealous there in its assumption that you don't have sites beyond the "first hop". ;) I'm going to enable that topology diag logging just so get a better understanding of it. Thanks for your help!