title: Team Foundation server 2015 - Delete old users
body: <p>I have a TFS server that has been moved between multiple physical servers and upgraded throughout versions 2005 -> 2015 during the past 10 years. It was working under a domain controller, but now its standing alone. When managing security and working with work items, it become like a mess. Too many old users are showing, some of them are duplicated with old names. However, we are dealing with windows users, so many of these users doesn't exists anymore. TFS web portal is showing a list of all existing users, but it doesn't offer delete option. </p>
  
  <ol>
  <li>How can I delete them (old users)?  </li>
  <li>Is it the right procedure to follow (I
  believe it won't be worst, as when I open work item owned by old
  user, TFS shows the old name, but give a warning that this user
  doesn't exists anymore)</li>
  </ol>