We are experiencing a frustrating issue with our Public Calendars in Outlook 2010. Meetings that have been scheduled months in advance are missing, but will then reappear.

If user A logs in @ 9:30 and goes to the calendar, certain meetings will be missing. 15 Minutes later, when user B logs in, the meetings are there. It is not tied to the actual user- I have seen this issue occur with the order of logging in reversed.

These are with meetings that were posted to the calender months ago, so it should not be an issue of an item being updated. We have not upgraded our Exchange environment (still running on 2003), but this is a new machine, running Windows 7 Professional, on a domain, running office 2010.

Are there any quirks or settings that I am missing or not aware of?