--- a/mailnews/base/src/nsMessengerWinIntegration.cpp
+++ b/mailnews/base/src/nsMessengerWinIntegration.cpp
@@ -118,18 +118,21 @@ static void activateWindow( nsIDOMWindow
   HWND hwnd = hwndForDOMWindow( win );
   if ( hwnd )
   {
     // Restore the window if it is minimized.
     if ( ::IsIconic( hwnd ) )
       ::ShowWindow( hwnd, SW_RESTORE );
     // Use the OS call, if possible.
     ::SetForegroundWindow( hwnd );
-  } else // Use internal method.
-    win->Focus();
+  } else {
+    // Use internal method.
+    nsCOMPtr<nsPIDOMWindow> privateWindow(do_QueryInterface(win));
+    privateWindow->Focus();
+  }
 }
 // end shameless copying from nsNativeAppWinSupport.cpp
 
 static void openMailWindow(const nsACString& aFolderUri)
 {
   nsresult rv;
   nsCOMPtr<nsIMsgMailSession> mailSession ( do_GetService(NS_MSGMAILSESSION_CONTRACTID, &rv));
   if (NS_FAILED(rv))
@@ -482,17 +485,17 @@ nsresult nsMessengerWinIntegration::Show
 
   bool showAlert = true;
 
   if (prefBranch)
     prefBranch->GetBoolPref(SHOW_ALERT_PREF, &showAlert);
 
   // check if we are allowed to show a notification
   if (showAlert && mSHQueryUserNotificationState) {
-    MOZ_QUERY_USER_NOTIFICATION_STATE qstate;    
+    MOZ_QUERY_USER_NOTIFICATION_STATE qstate;
     if (SUCCEEDED(mSHQueryUserNotificationState(&qstate))) {
       if (qstate != QUNS_ACCEPTS_NOTIFICATIONS) {
         showAlert = false;
       }
     }
   }
 
   if (showAlert)