Though I am unfamiliar with your scenario, perhaps you could post a typical list definition configuration (of a list that causes a problem). We might view a keyword that might confound things. /Pete At 18:24 6/19/2006 Monday, Bulterman, Henri R. wrote: >These days MITRE uses Exchange for mail and calendars. Our list server >We know that there is a problem with the Outlook calendar and the lists >on the list server: Users can apparently send an invitation to a list >on the list server, and that works OK, but if they then update the >meeting things get a bit messed up, with duplicate meetings scheduled.