Symptom : Any calendaring client may show 1 hour later on a recipients' calendar appointment (Outlook, OWA, Blackberry or Goode devices etc.). The recipient will appear to not follow DST2007 rules. This is true even with OS patches are successfully applied
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Read the complete post at http://blogs.technet.com/dst2007/archive/2007/03/12/calendar-appointments-showing-1-hour-later-on-recipients-calendar-appointments.aspx