I'm running Sharepoint 2003 with WSS 3.0, supporting two-way communication with Outlook 2007. We're transitioning a handful of public calendars in exchange to the Sharepoint services; as there aren't many items in them, we're simply using list view and cutting-and-pasting via Outlook.
So far, it's pretty simple.
On several calendars, it just seems to rampantly duplicate the calendar items - in one memorable case, over eight times resulting in nearly eighteen thousand items in the calendar. I believe, but can't yet confirm, that it's happening each time my local client syncs with the calendars in question.
What's going on, and how can I stop this repeated item duplication? It's making the calendars almost unusable, at this point. Right now, i can still wipe them out and replace the entries - but only because my users are holding off using these services for a day or so as we sort out troubles.