rem: if(folderResource) { var msgFolder = folderResource.QueryInterface(Components.interfaces.nsIMsgFolder); return msgFolder; }  return null; 
add: return GetMsgFolderFromResource(folderResource); 
context: function GetMsgFolderFromURI(folderURI){  var folderResource = RDF.GetResource(folderURI);  if(folderResource)  {    var msgFolder = folderResource.QueryInterface(Components.interfaces.nsIMsgFolder);    return msgFolder;  }  return null;}
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