The Euro-Office open source alternative launched to real fanfare in mid-2025, positioning itself as Europe’s answer to the dominance of Microsoft 365 and Google Workspace. Backed by a coalition of European tech companies including Nextcloud, IONOS, Proton, and Soverin, it promises GDPR-native architecture, full data sovereignty, and zero dependence on US-controlled cloud infrastructure. But does it actually deliver on those promises — and is it ready for everyday use?
What Is Euro-Office and Why Does It Exist?
Euro-Office is a fully open-source, cloud-based productivity suite built on OnlyOffice’s document engine. It covers documents, spreadsheets, presentations, and PDFs, with both browser-based and desktop clients available. The project was announced at a press event in Berlin and is developed collaboratively by more than a dozen European organisations, with source code publicly available on GitHub.
The motivation is straightforward: over 70% of European public-sector organisations rely on Microsoft 365 or Google Workspace for core productivity tasks, creating legal and geopolitical exposure under US jurisdiction. The EU’s push for digital sovereignty — accelerated by debates over the CLOUD Act and transatlantic data flows — has turned “owning your own stack” from an ideological position into a practical procurement priority.
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Document editors: Word-processor, spreadsheet, and presentation apps with real-time collaboration
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Cloud storage: European-hosted file storage integrated with Nextcloud
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Email and calendar: Built-in mail client and calendar, all GDPR-compliant by design
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Mobile apps: Android and iOS clients alongside the web interface
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Self-hosting option: Organisations can run the entire stack on their own servers
Euro-Office Open Source Alternative vs Microsoft 365
Microsoft 365 remains the benchmark for feature completeness, and a head-to-head comparison reveals both where Euro-Office genuinely competes and where gaps remain.
Compatibility
Because Euro-Office is built on OnlyOffice, it handles .docx, .xlsx, and .pptx files well — considerably better than LibreOffice has historically managed. Formatting round-trips with complex Word documents are largely preserved, which is a major practical win for any team that regularly exchanges files with external partners still on Microsoft’s ecosystem.
Collaboration Features
Real-time co-authoring works in the browser, and the Nextcloud integration means document versioning and shared drives feel familiar. However, Microsoft 365’s Teams-plus-Office integration — with its deep threading, loops, and meeting recordings — is still more mature. Euro-Office is closer to early-era Google Docs functionality than to the full Microsoft 365 experience circa 2025.
AI Tooling
Microsoft 365 Copilot is now embedded across Word, Excel, and PowerPoint. Euro-Office has no equivalent AI layer at launch — a gap that will matter more to productivity-focused teams as AI-assisted drafting becomes standard workflow.
Cost
Euro-Office is free and open source. Microsoft 365 Personal costs around €69/year in Europe, while Business plans start from around €6/user/month. That said, self-hosting Euro-Office is not zero-cost — server infrastructure, IT administration, and support add up. For smaller teams simply wanting a lower software bill, there is a genuinely compelling case here.
How the EU Sovereign Office Push Compares to LibreOffice
A fair question the open-source community is already asking: why Euro-Office and not LibreOffice, which has existed since 2011 and has a proven track record? The answer is largely about cloud-native architecture and collaborative editing. LibreOffice is primarily a desktop application with a separate (and less polished) online version. Euro-Office is web-first, built for simultaneous multi-user editing from day one — which is what organisations migrating away from Google Docs actually need.
LibreOffice also has the advantage of maturity and an enormous ecosystem of extensions, templates, and community documentation. Euro-Office 1.0 is, by definition, a first stable release. IT teams evaluating a switch should weigh that carefully.
Who Is the EU Sovereign Office Really For?
Euro-Office makes the most sense in specific contexts rather than as a universal replacement right now. The strongest use cases are:
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Public-sector organisations with regulatory obligations around data residency and GDPR compliance
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SMEs handling sensitive data — legal, healthcare, or financial firms subject to EU data protection rules
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Governments and municipalities following the lead of Denmark’s Ministry of Digitalisation, which has publicly committed to moving away from Microsoft
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Open-source advocates wanting a collaborative suite they can audit and self-host
For individual home users or small businesses primarily exchanging files with Microsoft Office users, the friction is likely not worth it today. Compatibility is good, but not perfect, and the polish of Microsoft’s desktop apps remains ahead.
Microsoft Office Alternatives That Are Available Right Now
If you are re-evaluating your office software stack, you do not have to wait for Euro-Office to mature. The broader landscape of Microsoft Office alternatives includes tools at every price point — including perpetual-licence versions of Microsoft Office itself, which give you full desktop functionality without the subscription model.
At Buy Now Key, you can get a genuine perpetual licence for Microsoft Office 2021 — which includes Word, Excel, PowerPoint, and Outlook — from just €19.10 for Office 2021 Professional Plus (OEM). That is a one-time payment with lifetime activation, no recurring fees, and no dependency on a cloud subscription service. For teams that want the proven reliability of Microsoft’s desktop apps without the annual cost of Microsoft 365, it is a practical middle ground.
If you need the most current perpetual release, the Microsoft Office 2024 range is also available — the latest one-time-purchase suite with updated features and extended support.
The Open Source Office Suite Debate: Ideology vs Practicality
The enthusiasm around Euro-Office reflects a genuine shift in how organisations think about software dependencies. The legal risk of storing EU citizen data on US-jurisdictioned infrastructure became impossible to ignore following a string of transatlantic data-transfer rulings. Open-source, European-hosted tools are no longer just a fringe preference — they are appearing in government procurement frameworks.
But “open source” is not a synonym for “ready for enterprise production”. Organisations that have tried to migrate to LibreOffice at scale will tell you that template incompatibility, macro support gaps, and user retraining costs can easily outweigh the licensing savings. Euro-Office needs to prove itself over several release cycles before most IT managers will treat it as a genuine tier-one option.
That doesn’t mean dismissing it — far from it. A credible open source office suite with real-time collaboration and European data hosting is exactly what the market has needed. The first stable release is a meaningful milestone, and the coalition behind it — Nextcloud alone has over 400,000 deployments worldwide — gives it genuine staying power.
Verdict: Is Euro-Office Worth Switching To Today?
The honest answer is: it depends on your situation. If data sovereignty and GDPR compliance are core requirements, Euro-Office deserves serious evaluation right now — especially for public-sector and regulated-industry use cases. If you simply want a capable, familiar, cost-effective office suite with proven compatibility and no ongoing subscription, a perpetual-licence Microsoft Office alternative remains the most practical choice for most users.
The competitive pressure Euro-Office represents is, in any case, a win for users across the board. Microsoft has long known that subscription fatigue is real — the existence of a credible European challenger keeps pricing and data practices in check.
FAQ
Is Euro-Office completely free to use?
Yes — Euro-Office is free and open source under a licence that allows anyone to use, modify, and self-host it. A managed cloud-hosted version may carry hosting costs depending on the provider, but the software itself has no licence fee. The source code is publicly available on GitHub.
Does Euro-Office work with Microsoft Office file formats?
Euro-Office is built on the OnlyOffice document engine, which has strong compatibility with .docx, .xlsx, and .pptx formats. Most standard documents open and save correctly, though highly complex formatting, custom macros, or specialised Word features may not transfer perfectly.
What makes Euro-Office different from LibreOffice?
The key difference is architecture: Euro-Office is cloud-native and web-first, with built-in real-time collaborative editing. LibreOffice is primarily a desktop application. Euro-Office is also newer (first stable release in 2025/2026), while LibreOffice has been mature and battle-tested since 2011.
Is a perpetual Microsoft Office licence a good alternative to subscription software?
For many users, yes. A perpetual licence like Microsoft Office 2021 gives you fully functional Word, Excel, PowerPoint, and Outlook with a single one-time payment and no recurring cost. You won’t get the continuous cloud updates of Microsoft 365, but for stable everyday productivity it is an excellent value option — and it is available from Buy Now Key from €19.10.
Which organisations is Euro-Office best suited to?
Euro-Office is best suited to public-sector organisations, European government bodies, and businesses in regulated industries (healthcare, legal, finance) that have strict data residency obligations under GDPR. Consumer and SME users with no specific sovereignty requirements will likely find current Microsoft Office versions more practical day-to-day.