A very flaky situation here. We run Exchange 5.5 and have a "company calendar" set up in public folders. All users have access to add items - works great. Except a certain user (running W2K and Outlook 2K) adds an item to a certain date and then reviews the date and can see all messages except her own - so, she adds it again with the same result ... all of the rest of us will now see the message twice. All permissions appear to be the same for this user as for all others.