On June 9, 2026, a coalition of European technology companies released Euro-Office 1.0 — a fully open-source productivity suite designed to compete directly with Microsoft 365 and Google Workspace, with a specific focus on EU data sovereignty and GDPR compliance.
Who built it and what it includes
The project is backed by IONOS, Nextcloud, Eurostack, XWiki, OpenProject, Soverin, Abilian, BTactic, and OpenXchange. The 1.0 release was published to GitHub and ships integrated into Nextcloud Hub 26 Spring, which launched the same day.
The suite covers the expected surface area: document editing, spreadsheets, presentations, email, file sync, project management, and real-time collaboration. It reads and writes DOCX, PPTX, PDF, and other standard formats. Under the hood it forks ONLYOFFICE's open-source codebase, enhanced by the consortium for interoperability, transparency, and long-term maintainability.
The actual target user
Euro-Office is not trying to win consumers away from Microsoft. The first target is public authorities, hospitals, universities, and regulated enterprises — organizations that face GDPR obligations and political pressure to stop routing documents through U.S.-governed infrastructure. That's not a niche: European governments at national and municipal levels spend billions annually on Microsoft licenses, and a string of data-localization rulings in the wake of Schrems II have made those contracts increasingly fraught.
The pitch is straightforward: here is a fully auditable, EU-hosted stack that meets your compliance obligations without sending employee documents to Seattle. For a finance ministry or a national healthcare system, that framing lands differently than it does for a small business comparing subscription prices.
The hard part comes next
Open-source office suites have been here before. LibreOffice is capable, mature, and largely ignored outside dedicated open-source environments. What's different this time is the consortium structure and the backing of cloud infrastructure players like IONOS, who can actually host the thing at scale with SLAs that public-sector IT departments require.
Whether that's enough to move procurement decisions at the institutional level is an open question. Switching costs in enterprise productivity software are real — not just data migration, but training, integrations, and organizational inertia. Euro-Office 1.0 is a credible start. Whether it graduates from "interesting alternative" to "actual replacement" depends on how much political will European governments show in backing it with contracts.
The source code is at GitHub. The Nextcloud Hub 26 integration makes it deployable today for organizations already running Nextcloud.