/**
  * @param Folder $folderTree
  * @param bool $folder
  */
 function _deletePop3FolderTree(&$folderTree, $result)
 {
     if ($folderTree->SubFolders != null && $folderTree->SubFolders->Count()) {
         foreach (array_keys($folderTree->SubFolders->Instance()) as $key) {
             $folder =& $folderTree->SubFolders->Get($key);
             $this->_deletePop3FolderTree($folder, $result);
         }
     }
     $result &= $this->PurgeFolder($folderTree);
     $result &= $this->DbStorage->DeleteFolder($folderTree);
     $result &= $this->DbStorage->DeleteFolderFilters($folderTree->IdDb, $this->_account->Id);
 }