Lyon follows Denmark and Germany in switching from Microsoft to open-source software

Lyon, France’s third-largest city, is embarking on a significant technological shift, mirroring movements seen in Denmark and Germany by transitioning away from Microsoft’s proprietary software suite towards open-source alternatives. This strategic move is driven by a desire to enhance digital sovereignty, reduce reliance on foreign technology providers, and promote greater control over its digital infrastructure and data. The city aims to foster a more independent and resilient technological ecosystem.

This transition is not merely a technical upgrade; it represents a broader European trend towards digital autonomy. As geopolitical tensions continue to shape international relations, many European nations and cities are re-evaluating their dependence on non-European technology giants. By embracing open-source solutions, Lyon seeks to align itself with this continental push for greater control over its digital destiny, ensuring that its technological future is guided by its own needs and values.

The Strategic Imperative: Digital Sovereignty and Autonomy

The decision by Lyon to migrate from Microsoft software to open-source alternatives is deeply rooted in the concept of digital sovereignty. This principle emphasizes a nation’s or region’s ability to exercise control over its digital infrastructure, data, and technological development, free from external influence or coercion. For Lyon, this means reducing its vulnerability to decisions made by foreign corporations or governments regarding software updates, data access, or even potential service disruptions.

This strategic imperative is amplified by ongoing global geopolitical shifts. The increasing awareness of how digital dependencies can translate into economic and political vulnerabilities has spurred a continental movement. By adopting open-source software, Lyon is actively working to build a more robust and self-determined digital future, lessening its susceptibility to external pressures and ensuring that its technological choices serve its citizens’ best interests.

Furthermore, the city’s initiative aligns with wider European Union discussions on data governance and digital autonomy. The EU has been vocal about the need for European nations to leverage their own technological capabilities and reduce over-reliance on a few dominant global tech players. Lyon’s move is a practical application of these broader policy objectives, demonstrating a commitment to fostering a more independent European digital landscape.

Key Open-Source Solutions Selected by Lyon

Lyon’s migration strategy involves the adoption of several key open-source software solutions to replace its existing Microsoft ecosystem. The city is transitioning to Linux as its operating system, a robust and widely supported open-source platform. This foundational shift provides a stable and flexible base for its digital operations.

For office productivity, Lyon has chosen OnlyOffice, a comprehensive office suite developed by Ascensio Systems. OnlyOffice offers a range of applications for document editing, spreadsheets, and presentations, providing a viable and feature-rich alternative to Microsoft Office. This selection is particularly notable as OnlyOffice is available under a free and open-source license, aligning with the city’s strategic goals.

In addition to these core replacements, Lyon is also adopting PostgreSQL for its database needs, a powerful and reliable open-source relational database management system. For collaboration and office automation, the city is implementing Territoire Numérique Ouvert (TNO), also known as Open Digital Territory. This platform, co-developed with local digital organizations, aims to provide secure, interoperable tools for communication, document collaboration, and videoconferencing, such as Jitsi.

The “Territoire Numérique Ouvert” (TNO) Initiative

The Territoire Numérique Ouvert (TNO) project represents a crucial component of Lyon’s open-source strategy, focusing on creating a collaborative digital platform for public entities and officers. This initiative is designed to pool digital resources across local actors, accelerate digital transition, and foster local economic value through partnerships with regional and national organizations.

TNO aims to strengthen trust in digital tools by emphasizing regional identity, sovereignty over deployed solutions, and certified security. The project has secured significant funding, including 2 million euros from the National Agency for Territorial Cohesion (ANCT) as part of the France Relance Plan. This funding supports the development and implementation of open-source solutions within the TNO framework.

By hosting its data centers within France and awarding over 50% of public contracts to companies in the Auvergne-Rhône-Alpes region, Lyon is actively promoting local economic development through the TNO project. This commitment to local procurement underscores the broader objective of technological self-reliance and regional empowerment.

Benefits of Open-Source Adoption in Public Sector

The shift to open-source software offers numerous advantages for public sector organizations like the city of Lyon. One of the most significant benefits is cost-efficiency. Open-source solutions typically have lower licensing fees compared to proprietary software, leading to substantial long-term savings. These savings can then be reinvested in other critical public services or technological advancements.

Beyond direct cost reductions, open-source software enhances transparency and control. With publicly accessible source code, governments can scrutinize the software’s inner workings, ensuring there are no hidden agendas or backdoors. This transparency builds trust with citizens and allows for greater oversight of how public data is managed and processed.

Moreover, open-source software provides flexibility and avoids vendor lock-in. Organizations are not tied to a single provider for updates, support, or future development. This freedom allows them to adapt the software to their specific needs, integrate it with other systems, and maintain control over their technological future without being beholden to proprietary roadmaps or pricing structures.

Denmark and Germany: Precedents for Lyon’s Transition

Lyon’s move is not an isolated incident but rather part of a growing wave of open-source adoption across Europe. Denmark has been a notable early adopter, with its Ministry for Digital Affairs piloting LibreOffice as a replacement for Microsoft Office 365. This initiative is driven by a strong emphasis on digital sovereignty and reducing dependence on foreign technology providers.

Similarly, the German state of Schleswig-Holstein has announced plans to phase out Microsoft software, including Teams, and transition to open-source alternatives such as LibreOffice and the Linux operating system. This decision reflects Germany’s broader strategy to enhance digital sovereignty and ensure greater control over its data infrastructure, particularly in light of geopolitical uncertainties.

These precedents demonstrate a clear trend among European governments and municipalities to prioritize open-source solutions. By following in the footsteps of Denmark and Germany, Lyon is positioning itself within a network of like-minded entities committed to building a more independent and resilient digital future for their citizens.

Addressing Challenges in the Migration Process

Migrating from a deeply entrenched ecosystem like Microsoft’s to open-source alternatives presents several challenges. One significant hurdle is user retraining. Approximately 10,000 civil servants in Lyon will require comprehensive training to adapt to new software and workflows, a process that began in June 2025. This investment in upskilling is crucial for ensuring a smooth and effective transition.

Compatibility issues with legacy Microsoft documents and systems can also pose a challenge. While open-source suites like OnlyOffice strive for high compatibility, certain advanced features or complex macros in older Microsoft files might require special attention or conversion. Ensuring seamless interoperability is key to maintaining productivity during the migration phase.

Furthermore, establishing dedicated support structures for open-source solutions is vital. Lyon is setting up an open-source IT support team to assist users and manage the new infrastructure. This proactive approach to support is essential for addressing user concerns, resolving technical issues, and fostering confidence in the new technological environment.

Environmental Sustainability and Hardware Lifespan

An often-overlooked benefit of transitioning to open-source software is its positive impact on environmental sustainability. Open-source solutions are typically less resource-intensive than their proprietary counterparts, meaning they can often run efficiently on older hardware. This capability allows municipalities to extend the lifespan of their existing computer equipment, reducing the need for frequent hardware upgrades.

By prolonging hardware usability, Lyon can significantly reduce its electronic waste. The constant cycle of purchasing new devices contributes to environmental degradation through manufacturing processes and disposal. Embracing open-source software, which is less demanding on hardware, directly combats this issue, contributing to a more circular and sustainable IT lifecycle.

This focus on extending hardware lifespan also translates into tangible cost savings. Rather than investing in new machines every few years, the city can allocate its budget more strategically. This approach not only benefits the environment but also enhances the city’s fiscal responsibility and operational efficiency.

The Role of Open-Source in Enhancing Local Economies

Lyon’s adoption of open-source software is strategically designed to bolster its local economy. By prioritizing procurement from regional and national companies, the city ensures that public spending on IT directly benefits businesses within its own territory. This approach fosters local innovation and job creation within the digital sector.

The TNO project, in particular, exemplifies this commitment by co-developing its collaborative platform with local digital organizations. This not only provides these organizations with valuable projects but also builds local expertise in open-source technologies. It creates a virtuous cycle where local talent and businesses are central to the city’s technological advancement.

Moreover, by promoting open standards and open-source solutions, Lyon contributes to the broader development of a European digital commons. This ecosystem encourages collaboration, knowledge sharing, and the creation of digital public goods that can be reused and adapted by other municipalities and public entities, further strengthening the regional and national digital landscape.

Comparison with Other European Open-Source Initiatives

Lyon’s strategic pivot aligns with a discernible pattern across Europe, where governments are increasingly prioritizing open-source solutions. Denmark’s Ministry for Digital Affairs, for instance, is actively piloting LibreOffice and Linux, aiming to enhance digital sovereignty and reduce reliance on external tech providers. Their phased approach, starting with half the staff and progressing to full adoption, offers a model for gradual implementation.

Germany’s state of Schleswig-Holstein is another significant example, having announced a comprehensive plan to phase out Microsoft products for open-source alternatives like LibreOffice and Linux. This initiative impacts tens of thousands of public servants and underscores a national commitment to digital independence and cost efficiency. The German federal government’s legislative push, mandating the prioritization of open-source solutions and standards in public procurement, further solidifies this trend.

These European initiatives collectively highlight a growing consensus on the strategic importance of open-source software. They demonstrate a shared commitment to achieving digital sovereignty, fostering innovation, and building more resilient and cost-effective public IT infrastructures, providing a robust framework for Lyon’s own ambitious transition.

Security Implications of Open-Source Adoption

A common concern regarding open-source software revolves around its security. However, the transparency inherent in open-source development often leads to enhanced security. With source code publicly available, a vast community of developers and security experts can scrutinize it for vulnerabilities. This widespread review process allows for the rapid identification and patching of security flaws, often faster than in proprietary systems where such scrutiny is limited.

Moreover, the open nature of the code prevents vendors from hiding malicious backdoors. Organizations can independently verify the software’s integrity, building a higher level of trust. While no software is entirely immune to security risks, the collaborative and transparent model of open-source development fosters a proactive approach to security, making it a robust choice for critical public infrastructure.

The ability for organizations to audit and, if necessary, modify the code themselves provides an additional layer of security control. This self-sufficiency is particularly valuable for public sector entities that handle sensitive data and must adhere to stringent security regulations. The proactive security model of open-source communities, combined with the potential for direct verification, offers a compelling security advantage.

The Future Outlook for Open-Source in European Governance

Lyon’s decision to embrace open-source software is indicative of a broader, accelerating trend across Europe. As more cities and governments prioritize digital sovereignty and seek alternatives to dominant proprietary software providers, the adoption of open-source solutions is set to grow. This shift is supported by policy initiatives at both national and EU levels, encouraging the use of open standards and open-source technologies.

The development of integrated European alternatives, such as the recently launched “Euro-Office,” further supports this transition by offering comprehensive suites that reduce the complexity of sourcing separate European providers. Such initiatives are crucial for making the move to open-source more accessible and attractive for public administrations.

The long-term outlook suggests that open-source software will play an increasingly pivotal role in shaping the digital infrastructure of European governance. This evolution promises greater autonomy, enhanced security, and more cost-effective public services, positioning cities like Lyon at the forefront of this transformative movement.