The operating system is the cornerstone of our digital lives. It provides the interface between users, applications, and hardware resources. Operating systems have greatly diversified in order to address users’ new needs and expectations. They exist for workstations, servers, connected objects, embedded systems, robotic systems, and more. Largely monopolised by Microsoft with Windows, primarily for workstations, this sector abounds with numerous alternatives on the server side, including UNIX systems, various Linux distributions, IBM’s z/OS, and of course Apple’s Mac OS. As Steve Jobs said, “I want people to be able to use our systems as easily as a ballpoint pen,” and for workstations, we are coming close. On the other hand, for servers, the tasks that need to be carried out in the skills to do so remain the preserve of experienced IT technicians, including system administration, networks, security, etc. These skills, which often encompass multiple systems, must constantly be maintained as new upgrades are released.