code: def export_items(ids)
        validate_version(VERSION_2010_SP1)
        ids = ids.clone
        [:item_ids].each do |k|
          validate_param(ids, k, true)
        end
        req = build_soap! do |type, builder|
          if(type == :header)
          else
        builder.export_item_ids!(ids[:item_ids])
          end
        end
        do_soap_request(req, response_class: EwsResponse)
      end
docs: Export items as a base64 string
   @see http://msdn.microsoft.com/en-us/library/ff709503(v=exchg.140).aspx
  
   (Requires Exchange version equal or newer than VERSION 2010 SP 1)
  
   @param ids [Array] array of item ids. Can also be a single id value