def empty_folder(opts)
      validate_version(VERSION_2010_SP1)
      ef_opts = {}
      [:delete_type, :delete_sub_folders].each do |k|
        ef_opts[camel_case(k)] = validate_param(opts, k, true)
      end
      fids = validate_param opts, :folder_ids, true

      req = build_soap! do |type, builder|
        if(type == :header)
        else
          builder.nbuild.EmptyFolder(ef_opts) {|x|
            builder.nbuild.parent.default_namespace = @default_ns
            builder.folder_ids!(fids)
          }
        end
      end
      do_soap_request(req)
    end
def empty_folder(opts)
      validate_version(VERSION_2010_SP1)
      ef_opts = {}
      [:delete_type, :delete_sub_folders].each do |k|
        ef_opts[camel_case(k)] = validate_param(opts, k, true)
      end
      fids = validate_param opts, :folder_ids, true

      req = build_soap! do |type, builder|
        if(type == :header)
        else
          builder.nbuild.EmptyFolder(ef_opts) {|x|
            builder.nbuild.parent.default_namespace = @default_ns
            builder.folder_ids!(fids)
          }
        end
      end
      do_soap_request(req)
    end
Empties folders in a mailbox.
 @see http://msdn.microsoft.com/en-us/library/ff709484.aspx
 @param [Hash] opts
 @option opts [String] :delete_type Must be one of
   ExchangeDataServices::HARD_DELETE, SOFT_DELETE, or MOVE_TO_DELETED_ITEMS
 @option opts [Boolean] :delete_sub_folders
 @option opts [Array<Hash>] :folder_ids An array of folder_ids in the form:
   [ {:id => 'myfolderID##asdfs', :change_key => 'asdfasdf'},
     {:id => 'blah'} ]
 @todo Finish