Explore the challenges and solutions in mixed reality development through a 21-minute Devoxx conference talk by Sébastien Broggi and Roman Messerli. Gain insights from their real-world experience with the Microsoft Hololens at Swiss Post, covering topics such as hologram placement, user interaction design, and hardware considerations. Learn about the Hololens' features, including its weight, glasses, sensors, and hardware capabilities. Discover the process of creating a first prototype for sorting racks, implementing a ring scanner, and addressing output, reliability, and performance issues. Understand the potential of mixed reality in practical applications and how to overcome key development hurdles in this emerging field.