We are using Office Small Business 2007 and Outlook calendar appointments are disappearing. We can create a new calendar appointment and send an invitation. The appointment appears on the calendar and you can literally watch the appointment disappear. The invitation still appears in the "sent box" of Outlook, but is no longer on the calendar. Thus, reminders and the actual appointment are gone. Reply invitations and acceptance of the appointments are received, but never recorded as the original appointment is gone.....
Running OS Windows Vista Premium SP 2 Build 6002