Euro-Office: The Default Format, a Divisive Choice

The context, in plain terms

A consortium of European companies announced the launch of Euro-Office, a sovereign open-source office suite, at a press conference in Berlin on March 27, 2026. The stable version 1.0 of this suite has been available for free download from public GitHub repositories since June 9, 2026. Euro-Office is a fork of OnlyOffice's Document Server and supports Microsoft Office formats (DOCX, XLSX, PPTX) as well as OpenDocument formats (ODT, ODS, ODP).

The project aims to offer an alternative to Microsoft 365 and Google Docs for public administrations, businesses, and educational institutions in Europe. The consortium initially includes 9 companies from 5 European countries, with mentions of 12 actors including Proton and Tuta in some sources. Euro-Office is distributed under the AGPLv3 license and integrates real-time collaboration for documents, spreadsheets, and presentations. Three days after the announcement, ONLYOFFICE publicly accused the consortium of license violation, triggering a legal controversy.

Several uncertainties surround this project. The exact number of companies in the consortium varies between 9 and 12 depending on the sources, and the inclusion of Proton and Tuta is not confirmed by all business sources. Microsoft's OOXML format as the default format is not explicitly confirmed as such in the sources, although native compatibility with DOCX, XLSX, and PPTX is attested. The figures of 2 million Europeans attracted, mentioned in a general public source, are not corroborated by verified business sources. Finally, the absence of major business press sources in search results makes exclusive confirmation through these channels difficult.

The Range of Reactions and the Blocs

The simulated panel of 57 voices reveals a range of divided reactions to the Euro-Office decision. Thirty-four voices express support, seeing this initiative as a step towards European digital sovereignty and a credible alternative to American giants. These voices value the open-source aspect and real-time collaboration capability, perceived as major assets for administrations and businesses.

Seventeen voices declare hostility to the decision, primarily due to the choice of Microsoft's OOXML format. They fear that this default compatibility compromises the project's true independence, keeping it under the influence of a dominant non-European player. For these voices, the goal of sovereignty is weakened by persistent technical dependence. Six voices express doubt, hesitating about the project's long-term viability or its ability to truly compete with existing solutions without falling into technical or legal traps.

The Fault Lines

A notable fault line appears with the reaction of an unexpected actor. The Director of Public Affairs for Microsoft Europe, despite representing a direct competitor and belonging to a group that largely leans against the decision, declares support for the launch of Euro-Office. This dissenting voice is an important signal for the decision-maker.

It is important to prioritize listening to this profile to understand the deep motivations behind such surprising support. This may reveal a strategy on Microsoft's part, a recognition of the project's legitimacy, or unexpected collaboration opportunities. The decision-maker must seek to identify what this voice perceives as an advantage or a point of convergence, to better anticipate competitive dynamics and refine their positioning.

The Dominant Friction and a Tipping Point

The dominant friction identified by the test bench is a disagreement in principle, centered on default OOXML compatibility. This disagreement is deep and stable, as confirmed by the fact that the panel's verdict remains at the same level across three independent engine passes. This means that the concerns raised are not superficial or fleeting, but rooted in strong convictions regarding technological independence.

At the same time, the bench notes that 11% of competitors are vocal but without real weight on the general reception of the decision. The decision-maker must distinguish this background noise from substantial criticism. There is no need to overreact to peripheral attacks or destabilization attempts that do not affect overall perception. Energy must be focused on resolving the disagreement in principle, which is the real obstacle to defuse before any broader exposure of the project.

The Verdict Explained and the Way Forward

The Kapari panel reaches cautious support, despite a majority of favorable voices. This verdict is accompanied by a high reception risk, primarily due to the persistent disagreement in principle surrounding the choice of the OOXML format. This caution indicates that while the initiative is generally well-received for its ambition of sovereignty, the details of its technical implementation raise significant reservations that could weaken its adoption.

To move forward, the decision-maker must first gather reactions from dissenting voices, such as that of the Director of Public Affairs for Microsoft Europe. Understanding why a competitor declares support for the decision can offer unexpected avenues to strengthen the project or anticipate future reactions. Next, it is important not to be distracted by the noise from a minority of competitors without weight. Attention must remain focused on the disagreement in principle, by developing a clear message that justifies the choice of OOXML while reaffirming the commitment to independence. The stability of the verdict over several passes confirms that this disagreement is fundamental and requires a robust communication and technical strategy, rather than a simple tweak.

Questions about this case

Related cases