title: Automate upgrade of TFS Build servers on custom directory
body: <p>The procedure for unattended configuration is well defined (<a href="http://blogs.msdn.com/b/tfsao/archive/2012/10/01/unattended-installation-of-tfs-2012.aspx" rel="nofollow">Unattended Install of TFS 2012</a>), while the setup part is obscure at best. The only known command is</p>
  
  <blockquote>
    <p>tfs_server.exe /quiet</p>
  </blockquote>
  
  <p>but there is no way to specify a different installation folder.</p>
  
  <p>I have tens of build servers to upgrade from 2012.4 to 2013, and need to automate the process.</p>