/**
  * @param Folder $folder
  * @return bool
  */
 function GetFolderMessageCount(&$folder)
 {
     $countArray = $this->_imapMail->get_all_and_unnread_msg_count($folder->FullName);
     if ($countArray == null) {
         return false;
     }
     $folder->MessageCount = $countArray[HKC_ALL_MSG];
     $folder->UnreadMessageCount = $countArray[HKC_UNSEEN_MSG];
     return true;
 }