Earlier I linked to a post by Henning Krauses which discusses searching for a meeting using the UID and GlobalObjectId properties. The point of UID is to provide a unique identifier for a meeting across the calendars each attendee to the same meeting...

Prior to Exchange 2007 SP1 an article was published with some specific guidance related to handling time zones in calendar item tasks.  Contrary to Best Practices for Using Exchange Web Services for Calendaring Tasks , specifying just a MeetingTimeZone...