Microsoft’s Build developer conference got off to a bit of a rocky start on Monday. During the keynote, meant to demonstrate how the HoloLens 2 augmented reality headset could recreate the Apollo 11 moon landing in mixed reality, the presenters ran into technical difficulties. Microsoft partnered with Epic Games and Industrial Light & Magic chief creative officer John Knoll for the ambitious demo that worked well during earlier rehearsals. Despite the tech glitches during the live presentation, the HoloLens 2 remains an impressive device. A recording of the demo, captured as intended during rehearsals, is available on YouTube.