Euro-Office 1.0: Europe's New Open-Source Answer to Microsoft 365

On 9 June 2026, Euro-Office reached its first stable release. It is an AGPL-licensed office suite forked from ONLYOFFICE, backed by a coalition of European providers including Nextcloud, IONOS, and Proton. The launch is one of the more concrete milestones in Europe's push to reduce dependence on Microsoft 365 and Google Workspace for everyday document work.

This is a short briefing on what Euro-Office is, why the backing matters, and who should consider it.

What Euro-Office Is

Euro-Office is a full office suite covering documents, spreadsheets, and presentations, with real-time collaborative editing. Because it is forked from ONLYOFFICE, it inherits strong compatibility with Microsoft Office file formats, which is usually the single biggest barrier to switching. The AGPL license means the code is open and the project cannot quietly become a closed, foreign-controlled product later.

Why the Backing Matters

Open-source office suites are not new. What makes Euro-Office notable is the coalition behind it. Nextcloud brings collaboration and self-hosting expertise, IONOS brings European cloud infrastructure, and Proton brings a privacy-first user base and brand. That combination gives the project something previous forks lacked: a credible path to hosting, support, and long-term maintenance inside European jurisdiction.

For public administrations under growing pressure to adopt sovereign tooling, a suite that is open source, EU-backed, and format-compatible is exactly the kind of option that procurement teams have been asking for.

Who Should Consider It

• Public sector bodies that need document collaboration without US-controlled infrastructure.
• Privacy-sensitive organisations already using Nextcloud or Proton, where Euro-Office slots into an existing stack.
• Businesses running a sovereignty review who want a low-risk place to start, since office documents are a high-volume, relatively contained workload.

What to Watch

A 1.0 release is a starting point, not a finished story. The practical questions over the next year are about ecosystem maturity: add-ins, mobile clients, large-organisation administration, and how smoothly mixed environments handle complex Microsoft files. The backing coalition makes those gaps likely to close, but they are worth testing on a pilot before any large migration.

The Bottom Line

Euro-Office is a meaningful addition to the European software stack. It pairs genuine format compatibility with open-source governance and serious European backing. For organisations mapping their move away from US-controlled productivity tools, it deserves a place on the shortlist.

You can find more European productivity and collaboration tools in our directory.