AirPlay mirroring on an Apple TV for PowerPoint presentations inside a firewall

  • 3rd generation Apple TV works with an old LCD projector with the help of HDMI-VGA converter HDVG-001.
  • Though Apple TV inside a firewall cannot be activated, cannot connect to iTunes Store, AirPlay mirroring does work.
  • Perhaps depending on the mac and the projector, the image is somewhat truncated on both sides or the precise aspect ratio is not realized. For me, these are acceptable.