code: def time_zone_definition!(zone)
        attributes = {'Id' => zone[:id]}
        attributes['Name'] = zone[:name] if zone[:name]
        nbuild[NS_EWS_TYPES].TimeZoneDefinition(attributes)
      end
docs: Specify a time zone
   @todo Implement subelements Periods, TransitionsGroups and Transitions to override zone
   @see http://msdn.microsoft.com/en-us/library/exchange/dd899488.aspx