On the rare occasion that you need to forcefully kill the Pentagon Mail background processes you should be aware that the Launcher and the Background filer look after each other, so if you kill one it will be re-spawned by the other immediately. So to kill them completely you will need to use the 'End process tree' feature of Task Manager:


  1. Start the Windows Task Manager 
  2. Select the 'Details' tab
  3. Sort the list by the 'Name' column
  4. Scroll down to the find the three Pentagon Mail processes
  5. Right-click the Launcher and select 'End process tree'