Euro-Office 1.0 Launch: Europe’s AGPL Office Fork for Sovereign Document Collaboration

Euro-Office, the AGPL-licensed office suite forked from ONLYOFFICE, reached its first stable release on June 9, 2026, backed by a coalition of European cloud providers including Nextcloud, IONOS, and Proton. The launch marks a significant milestone in the continent’s push for digital sovereignty, offering businesses and public administrations a fully open-source alternative to dominant US-based productivity platforms with native Microsoft OOXML compatibility.

A Sovereign Productivity Suite for the European Cloud

The 1.0 release of Euro-Office is the culmination of a two-year effort to create a community-driven office suite that respects European data protection standards. The project originated from concerns that existing open-source office tools either lacked robust cloud collaboration features or relied on proprietary components. By forking the mature ONLYOFFICE codebase under the AGPLv3 license, the developers ensure the entire stack remains free and auditable, eliminating licensing ambiguity that has dogged similar initiatives.

Euro-Office inherits the full-featured editors of ONLYOFFICE—document, spreadsheet, and presentation—but strips away proprietary dependencies and telemetry. The interfaces support both real-time co-editing and paragraph-locking, making it suitable for everything from casual note-taking to complex legal drafting. Crucially, the suite achieves near-perfect rendering of Microsoft Office files, including .docx, .xlsx, and .pptx, thanks to its use of the same open-source engine that ONLYOFFICE employs. This compatibility is a non-negotiable requirement for enterprises that exchange documents with Microsoft 365 users daily.

Why AGPL Matters: Locking Openness In

The choice of the GNU Affero General Public License v3 is deliberate. Unlike the LGPL or permissive MIT licenses, AGPL requires anyone who modifies the software and offers it as a network service to publish their changes. This “copyleft” provision prevents cloud providers from creating proprietary derivatives, a strategy Microsoft and Amazon have used with other open-source projects. Euro-Office’s backers insist that any hosted version must contribute improvements back to the community, ensuring a level playing field across European cloud services.

ONLYOFFICE itself distributes a Community Edition under AGPL, but its enterprise offerings include closed-source components and license restrictions. Euro-Office eliminates that dual licensing model, offering everything under a single AGPL umbrella. This simplifies compliance for governments and regulated industries that need to conduct thorough code audits. The KDE community and the Free Software Foundation Europe have publicly endorsed the approach, seeing it as a template for future European software infrastructure.

Built on European Infrastructure

The project’s backing reveals a strategic alliance between collaboration platform providers, hosting companies, and secure communication vendors. Nextcloud, the German open-source file sync and share solution, has integrated Euro-Office as a first-class document editor within its ecosystem. Users can now create, edit, and co-author Office files directly from Nextcloud’s web interface or desktop clients, with all data staying on their own servers. IONOS, one of Europe’s largest hosting providers, offers pre-configured virtual machines and managed Kubernetes deployments, lowering the barrier for small and medium businesses.

Proton, known for its encrypted email and VPN services, contributed its end-to-end encryption protocols to Euro-Office’s secure sharing features. Documents shared via Proton Drive or through Euro-Office’s native encrypted links remain inaccessible even to the server operator. This combination of self-hosted collaboration and zero-knowledge encryption positions Euro-Office as the most privacy-respecting office suite on the market, directly challenging the surveillance advertising models of Google Workspace and Microsoft 365.

Key Features and Technical Highlights

• Full OOXML Support: Opening, editing, and saving in Microsoft Office formats with high fidelity, including support for complex elements like tracked changes, macros (via JavaScript), and pivot tables.
• Real-Time Co-Editing: Multiple users can work on the same document simultaneously with fast synchronization, rivaling the performance of Google Docs.
• Self-Hosted or Cloud: Deployable on-premises via Docker, Kubernetes, or bare metal, with optional managed hosting from IONOS or other European providers.
• Plugin Ecosystem: A growing library of plugins allows integration with popular services like DeepL for translation, Zotero for reference management, and OnlyOffice macros for automation—all adapted to the AGPL license.
• Mobile and Desktop Apps: Euro-Office provides native apps for Windows, macOS, Linux, iOS, and Android, all syncable with a self-hosted server.
• Integrated Chat and Comments: Built-in messaging allows context-aware conversations without leaving the editor.

How It Compares to Alternatives

Euro-Office enters a crowded field. LibreOffice, the venerable open-source suite, dominates the desktop but lacks seamless cloud collaboration. Collabora Online, based on LibreOffice technology, requires a separate server component and does not match ONLYOFFICE’s compatibility with complex OOXML documents. Microsoft 365 and Google Workspace offer unmatched convenience but tie users to US-based cloud infrastructures and proprietary formats, raising concerns under GDPR and the recently enacted EU Data Act.

A detailed feature comparison illustrates the differences:

Euro-Office’s combination of OOXML fidelity, self-hosted collaboration, and strong encryption gives it a unique position for organizations that cannot legally use US cloud services due to data residency laws or the risk of extraterritorial access under the US CLOUD Act.

Real-World Adoption and Early Feedback

Within the first week of its stable release, Euro-Office was downloaded over 80,000 times, with notable deployments announced by the City of Munich’s IT department and the University of Amsterdam. The city of Munich, which famously oscillated between Linux and Microsoft, plans to migrate 5,000 municipal employees to Euro-Office integrated with a Nextcloud backend by early 2027. IT administrators praise the ease of installation and the transparent licensing, while end-users report that the interface feels familiar and responsive.

Community forums are already buzzing with feature requests and bug reports. Top priorities include improved support for legacy .doc files and deeper integration with OpenID Connect providers for single sign-on. The development team, a mix of paid contractors from the supporting companies and community volunteers, has committed to a monthly release cadence with long-term support (LTS) versions every two years—mirroring the Ubuntu release model.

Challenges and Roadmap

Gaining mainstream adoption will require overcoming network effects. Most organizations are deeply entrenched in Microsoft ecosystems, and moving away involves retraining staff and converting years of legacy documents. Euro-Office’s roadmap addresses this with import wizards for SharePoint and OneDrive data, allowing phased migration. The team also plans to introduce AI-assisted writing features similar to Microsoft’s Copilot, but trained exclusively on on-premises data to respect privacy.

Another challenge is sustaining development. While the initial coalition has pledged €12 million over three years, long-term funding will depend on a mix of enterprise support contracts and contributions from public sector users. The project leadership is exploring a foundation structure under Belgian law to ensure neutrality and multi-stakeholder governance.

The Bigger Picture: Digital Sovereignty in Action

Euro-Office is not just a software product; it is a political statement. European policy makers have long called for alternatives to US technology stacks, but rhetoric has seldom translated into viable products. By building on a proven open-source foundation and leveraging the combined market reach of Nextcloud, IONOS, and Proton, Euro-Office demonstrates that a community-led, privacy-first office suite can be both functional and commercially viable.

The release also intensifies the debate around the EU’s Digital Markets Act and its interoperability requirements. If major platforms are forced to open their ecosystems, Euro-Office’s native OOXML support and open APIs make it a ready-made alternative that does not lock users into a single vendor. For Windows enthusiasts, Euro-Office offers a way to break free from Microsoft’s subscription model while retaining full compatibility with the documents they already own.

Getting Started

Euro-Office is available immediately for Windows (7 and later), macOS, Linux, and mobile platforms. Windows users can download an MSI installer from the official website. For those who prefer not to self-host, IONOS and Nextcloud providers offer hosted trials with free tiers for up to 10 users. The source code is published on GitHub under the official Euro-Office organization, and contribution guidelines welcome developers, translators, and documentation writers.

With its first stable release, Euro-Office makes a compelling case that European cloud collaboration can be open, secure, and fully sovereign. The project’s success will depend on sustained community engagement and the willingness of organizations to bet on an alternative that puts data control back in their hands.