What shipped, and how it got here
The browser-based suite came first. Nextcloud says it released the first production-ready version of Euro-Office on June 9, 2026. The desktop client was announced with Nextcloud Hub 26 Summer. At the time, Neowin reported that the Hub release was available immediately, but the desktop app would arrive separately in the coming weeks. Those weeks have now passed.
Keep the two milestones separate. The June release was the suite. The desktop app is the newer addition, and it matters most to people who don't want to run their documents through a browser tab.
Platform support
The platform list is narrower than "Windows, macOS and Linux" suggests. Nextcloud's list is:
- Windows: x64 and ARM64
- Linux: .deb packages (Debian, Ubuntu) and .rpm packages (Fedora)
- macOS: Apple Silicon only
An independent download page run by VoxCloud adds some detail. It is not the official project site and says so. It reports that version 9.3.6 was released on 22 October 2026. It also says the macOS build needs an M1 or newer chip and that Intel Macs aren't supported. The same page lists a tar.xz and ARM option for Linux. It says there is no iPhone, iPad or Android app yet, and that the app isn't in the Mac App Store or on Flathub. Treat these as a snapshot, because availability can change.
Offline editing and collaboration
The Euro-Office Desktop Editors repository describes the app as a free, open-source suite that works offline. It also says it can connect to Nextcloud, ownCloud and Seafile for real-time co-authoring.
Nextcloud's description of the workflow is that you edit files locally and save the changes back to your Nextcloud while collaborating with others, whether they use desktop clients, mobile or a browser.
In practice:
- Local editing needs no server.
- Co-authoring needs a connected service.
- The cloud link is optional for solo work, but it isn't a way to collaborate while offline.
Formats: stated support, not guaranteed fidelity
The project lists DOCX, XLSX and PPTX, plus ODT, ODS, ODP, CSV and PDF. Its README promises "maximum compatibility" and "flawless" work. Those are the project's own claims, not independent test results.
Anyone who has moved a heavily formatted Word document between suites knows where trouble tends to show up. Complex tables, tracked changes, macros and embedded objects are the usual suspects. If you plan a pilot, test your own messiest documents first.
Nextcloud notes that the app uses fonts installed on your machine, including corporate fonts and default OS fonts such as Microsoft fonts on Windows. That matters for layout fidelity. The repository also advertises password encryption and digital signatures. The wider Neowin report adds fallback fonts, certificate requirements and finer protection settings. I could not confirm those specifics in official documentation, so check them yourself before relying on them. Neowin's claim that the app connects to several Nextcloud instances at once is also something I could not corroborate.
Two builds from one codebase
Most readers will care about this part. There are two distribution tracks. The project's GitHub page describes them as Nextcloud Office, with signed builds for production use, and Euro-Office, with unsigned community builds for testing and contributing.
The installation documentation says the community builds are for evaluation, testing and contribution. It warns that Euro-Office Desktop Editors packages are not code-signed and aren't recommended for regulated environments or managed device rollouts. It says the Nextcloud Office builds are signed for Windows and macOS, verified for integrity, and suitable for managed rollouts. It adds that Nextcloud tests them against its own releases and offers package repositories.
For admins, that comes down to a few points:
- Signing affects the OS publisher warning and deployment suitability. It isn't evidence that the two builds have different editing features.
- The VoxCloud page says the unsigned Windows and macOS installers trigger OS warnings. A warning alone doesn't mean malware, but it also isn't something to click through casually. Verify where the file came from.
- If you want to try it or deploy it to users, the project itself recommends the Nextcloud Office build.
- The sources don't describe an enterprise deployment procedure or automatic updating. Plan to confirm both yourself.
Licensing and background
Euro-Office is AGPL-3.0 licensed. According to the VoxCloud page, it began in March 2026 as a fork of ONLYOFFICE. The licensing dispute that followed is part of why the project drew criticism early on. Nextcloud and its partners dispute the claims about additional license terms. Wikipedia's coverage notes that OnlyOffice announced it would suspend its partnership with Nextcloud due to the conflict.
The partners behind the project include IONOS, Nextcloud, XWiki, OpenProject and others. The GitHub page describes Euro-Office as more of an integration component than a standalone suite. The desktop app is a step towards a more conventional product.
Should Windows users bother?
If you want an AGPL-licensed office suite that opens DOCX files and doesn't depend on Microsoft's cloud, this is now worth a trial. It also suits people who already run Nextcloud, since the same engine then runs in the browser and on the desktop.
It isn't a drop-in Microsoft 365 replacement for everyone. There is no mobile app yet, Intel Macs are excluded, and the format fidelity claims are untested. European data-sovereignty is also a matter of where your Nextcloud or other cloud service stores files. The app alone doesn't settle that.
A sensible trial plan:
- Install the signed Nextcloud Office build on a test machine.
- Open a representative sample of your Word, Excel and PowerPoint files.
- Compare the layout against Microsoft Office or LibreOffice.
- Connect it to a test Nextcloud instance and check co-editing with a colleague.
- Only then decide whether to roll it out more widely.