Following similar moves by Denmark, the German state of Schleswig-Holstein and the city of Lyon—France’s third-largest city and a major economic centre—has initiated a migration from Microsoft Windows and Office to a suite of open-source alternatives, including Linux, OnlyOffice, NextCloud, and PostgreSQL.
This transition is part of Lyon’s broader strategy to strengthen digital sovereignty and reduce reliance on foreign technology providers. As with other European initiatives, the decision aligns with wider EU discussions about data governance and digital autonomy. Concerns over control of sensitive data and long-term sustainability have contributed to increased interest in open-source solutions.
Although Microsoft has publicly affirmed its commitment to supporting EU customers regardless of political context, some European public authorities continue to explore alternatives that allow for local control over software infrastructure and data hosting.
In line with the European Commission’s 2025 State of the Digital Decade report—which notes that Europe has yet to fully leverage the potential of open-source technologies—Lyon aims to enhance both transparency and control over its digital systems.
Lyon’s migration also supports regional economic development. Its collaboration platform, Territoire Numérique Ouvert (Open Digital Territory), is being co-developed with local digital organisations and will be hosted in regional data centres. The project provides secure, interoperable tools for communication, office productivity, and document collaboration.
The city has begun gradually replacing Windows with Linux and Microsoft Office with OnlyOffice across municipal workstations. OnlyOffice, developed by Latvia-based Ascensio System SIA, is an open-source productivity suite distributed under the GNU Affero General Public License. While it shares a similar open-source ethos with LibreOffice, which was chosen in Demark to replace Microsoft, the two are not directly related.
It is reported that Lyon anticipates cost savings through extended hardware lifespans, a reduction in electronic waste, and improved environmental sustainability. Over half of the public contracts for this project have been awarded to companies based in the Auvergne-Rhône-Alpes region, with all awarded to French firms—highlighting a preference for local procurement.
Training for approximately 10,000 civil servants began in June 2025. The initiative is being monitored as a potential model for other municipalities aiming to enhance digital resilience and reduce dependency on proprietary software ecosystems.
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