Lyon, the third-largest city in France, is transitioning from Microsoft’s Windows and Office suite to open-source alternatives such as Linux, OnlyOffice, NextCloud, and PostgreSQL. This move is part of a broader strategy among European governments to enhance digital sovereignty and reduce reliance on American technology firms due to concerns over data security and autonomy. The city is developing a collaborative suite called Territoire Numérique Ouvert in partnership with regional digital organizations, which will be hosted in local data centers. The migration process is already underway, with municipal workstations moving from Windows to Linux and Microsoft Office being replaced by OnlyOffice. Lyon expects direct cost savings from this migration, including extending the lifespan of municipal hardware and reducing electronic waste. Over 50% of public contracts related to this project have been awarded to firms within the Auvergne-Rhône-Alpes region, all to French companies. Training for approximately 10,000 civil servants began in June 2025 as part of the transition to Linux.