A broad coalition of European technology organisations is preparing to publicly release Euro-Office 1.0 on June 9, 2026 — a web-based, open-source office suite built to offer governments, educational institutions, and enterprises a sovereign alternative to proprietary US platforms such as Microsoft 365 and Google Docs.

The project, announced in Berlin on March 27, 2026, will make its first stable release available for download on GitHub. From day one, Euro-Office will be delivered as a web editor integrated directly within the products of its founding partners, rather than as a standalone desktop application.

A Pan-European Consortium

Euro-Office is the result of collaboration among more than a dozen European companies and organisations. The founding consortium includes IONOS, Nextcloud, Eurostack, XWiki, OpenProject, Soverin, Abilian, BTactic, OpenXchange, and Office.eu. The initiative brands itself as Europe’s own SaaS office platform, built on open-source principles and designed to strengthen the continent’s digital autonomy.

Euro-Office at a Glance

  • Launch date: June 9, 2026 (GitHub public release)
  • Format: Web editor integrated within partner platforms
  • Based on: Fork of OnlyOffice open-source codebase
  • Supported formats: DOCX, XLSX, PPTX, PDF, TXT
  • Features: Real-time collaborative editing of documents, spreadsheets, and presentations
  • Desktop & mobile: Planned for later in summer 2026
  • Target users: Government agencies, education systems, enterprises

Familiar by Design

Euro-Office prioritises compatibility with Microsoft file formats — DOCX, XLSX, and PPTX — and its user interface is deliberately designed to feel familiar to anyone accustomed to Microsoft 365, minimising the learning curve for new users. The software is built on a fork of OnlyOffice’s open-source codebase, which has been significantly reworked: Russian-language code comments have been translated into English to support broader international collaboration, and automated testing systems have been introduced to improve reliability.

IONOS Managed Nextcloud customers will be able to install Euro-Office immediately after the June 9 launch. IONOS plans to roll it out more broadly within its Nextcloud Workspace later in the summer. French knowledge management platform XWiki is expected to integrate the suite in the fourth quarter of 2026, while Netherlands-based Office.eu will also adopt it on a rolling basis.

Geopolitics as a Driver

Proponents of the initiative are frank about the geopolitical motivations behind Euro-Office. The surge in demand for digitally sovereign European solutions has been particularly pronounced since the start of 2025, as tensions between the EU and major US technology companies have intensified.

“The geopolitical changes of the past year have highlighted the urgent need in Europe for a reliable, fully Microsoft-compliant, and easy-to-use sovereign office suite. Our joint initiative has resulted in an office software suite with a highly familiar interface capable of handling documents, presentations, and spreadsheets.”
— Achim Weiss, CEO of IONOS

The platform targets a specific segment of the market: it is not aimed at replacing every consumer’s productivity app, but rather at sitting inside file-sharing platforms, wikis, project management tools, and hosted collaboration environments that European public-sector organisations already use — or can procure more easily under EU procurement rules.

Challenges Ahead

The launch does not come without controversy. Euro-Office has faced legal disputes with OnlyOffice — the company whose open-source codebase forms the project’s foundation — as well as debate within the open-source community over document format standards, specifically whether to prioritise Microsoft’s OOXML format or the open ODF standard. These tensions have made the path to launch anything but smooth, though the consortium has pushed forward regardless.

With desktop and mobile versions planned for the coming months, Euro-Office represents one of the most coordinated attempts yet by European industry to reduce the continent’s dependence on US-controlled office software infrastructure.