We are having a problem with several of our SharePoint calendar lists where a huge (200+) number of items are somehow getting updated at exactly the same time. This puts these events into the "Pending" state even though the update did not change any fields (visible, at least). The individuals who are listed as the "Modified By" user deny making these changes, and in at least one case the user was out of the office.
What could be causing this problem? My suspicion is Outlook integration.