diff --git a/mail/base/content/mailWindowOverlay.js b/mail/base/content/mailWindowOverlay.js
index 800d2f8244..e7a0dba2b9 100644
--- a/mail/base/content/mailWindowOverlay.js
+++ b/mail/base/content/mailWindowOverlay.js
@@ -2130,72 +2130,6 @@ function MsgCreateFilter() {
   }
 }
 
-function MsgNewFolder(callBackFunctionName) {
-  var preselectedFolder = GetFirstSelectedMsgFolder();
-  var dualUseFolders = true;
-  var server = null;
-  var destinationFolder = null;
-
-  if (preselectedFolder) {
-    try {
-      server = preselectedFolder.server;
-      if (server) {
-        destinationFolder = getDestinationFolder(preselectedFolder, server);
-
-        var imapServer = server.QueryInterface(Ci.nsIImapIncomingServer);
-        if (imapServer) {
-          dualUseFolders = imapServer.dualUseFolders;
-        }
-      }
-    } catch (e) {
-      dump("Exception: dualUseFolders = true\n");
-    }
-  }
-  window.openDialog(
-    "chrome://messenger/content/newFolderDialog.xul",
-    "",
-    "chrome,titlebar,modal",
-    {
-      folder: destinationFolder,
-      dualUseFolders,
-      okCallback: callBackFunctionName,
-    }
-  );
-}
-
-function getDestinationFolder(preselectedFolder, server) {
-  var destinationFolder = null;
-
-  if (!preselectedFolder.canCreateSubfolders) {
-    destinationFolder = server.rootMsgFolder;
-
-    var verifyCreateSubfolders = null;
-    if (destinationFolder) {
-      verifyCreateSubfolders = destinationFolder.canCreateSubfolders;
-    }
-
-    // In case the server cannot have subfolders, get default account and set
-    // its incoming server as parent folder.
-    if (!verifyCreateSubfolders) {
-      let defaultFolder = GetDefaultAccountRootFolder();
-      let checkCreateSubfolders = null;
-      if (defaultFolder) {
-        checkCreateSubfolders = defaultFolder.canCreateSubfolders;
-      }
-
-      if (checkCreateSubfolders) {
-        destinationFolder = defaultFolder;
-      }
-    }
-  } else {
-    // XXX TODO: why do we select the preselectedFolder
-    // even if it can't create subfolders?
-    destinationFolder = preselectedFolder;
-  }
-
-  return destinationFolder;
-}
-
 /** Open subscribe window. */
 function MsgSubscribe(folder) {
   var preselectedFolder = folder || GetFirstSelectedMsgFolder();