Hi Exchange and Outlook developers!!
I found this wonderful article, which describes a change in how Microsoft Office Outlook 2003 Service Pack 2 (SP2) and later service packs, Microsoft Exchange Server 2003 Service Pack 2 (SP2), and later versions of Exchange Server and of Outlook handle meetings. This new design addresses disappearing-meeting scenarios that were introduced by Outlook 2003 in cached mode.
The new design does not have a visible effect on end-users. However, the new design can affect custom solutions that integrate with the calendar features in Outlook. This article describes the new design so that developers of custom solutions can update those solutions if it is required