HoloStream was a quick research project to explore the cross media collaboration between Mixed Reality and Virtual Reality. In this use case a on-site maintenance worker wears an AR headset. He is guided by an expert assistant who is not on site wearing a VR headset. The HoloLens constantly scans its environment and streams geometry and texture data to the VR system, so that the assistant can teleport himself into the on-site environment. Both participants can see each other as avatars and can communicate via voice and gestures.