A office suite refers to a set of software for word processing, spreadsheets, and presentations that can work together and share common file formats. Microsoft 365 has dominated this segment for decades, but the market has changed: alternatives now cover document processing, cloud storage, and real-time collaboration, sometimes without a paid license.
Data Sovereignty: The Criterion That Microsoft 365 Does Not Resolve Alone
Since 2025, several European countries and public organizations have been initiating partial or total exit plans from Microsoft 365 for reasons of digital sovereignty. The issue goes beyond mere software preference: it touches on data localization, applicable law on servers, and GDPR compliance.
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Microsoft hosts part of its services on infrastructures subject to U.S. law. For a French or European company handling sensitive data (health, legal, public finances), this dependency poses a concrete problem. The hosting location determines the applicable law to the files, not the user’s nationality.
Solutions like Nextcloud offer self-managed hosting or hosting with a certified European provider. The company retains control over its documents, backups, and access. Finding the best alternative to Microsoft 365 also involves auditing where work files transit and reside.
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Compatibility of Office Formats: The True Test of an Office Alternative
Replacing Word, Excel, or PowerPoint only makes sense if existing documents remain usable. Compatibility with .docx, .xlsx, and .pptx formats is the first technical filter.
LibreOffice and the OpenDocument Format
LibreOffice uses the OpenDocument format (ODF) by default but can open and save Microsoft files. Simple text documents pass without difficulty. Complex Excel spreadsheets (VBA macros, advanced pivot tables) pose more problems. VBA macros are not natively supported by LibreOffice, requiring them to be rewritten or omitted.
ONLYOFFICE and Fidelity to Microsoft Formats
ONLYOFFICE adopts a different strategy: the suite directly uses Microsoft formats as native formats. The rendering of Word documents and PowerPoint presentations is generally more faithful than with LibreOffice. For a structure that exchanges .docx files daily with partners using Microsoft, this fidelity reduces time lost in formatting corrections.
Integrated Generative AI: A Functional Gap to Measure
Microsoft pushes Copilot in Word, Excel, Outlook, and Teams. Assisted writing, automatic document summarization, and data analysis through natural language queries are part of the offering. No open-source alternative currently offers such an integrated native equivalent.
ONLYOFFICE does not have native generative AI and refers to paid external models for this type of functionality. LibreOffice does not integrate any AI modules. Google Workspace offers AI functions in Docs and Sheets, but their scope remains different from Copilot.
For standard office use (writing a letter, managing a budget, preparing a presentation), the absence of AI does not change daily operations. The gap becomes visible in heavy document synthesis tasks or analyzing large datasets in a spreadsheet. Before paying a premium for AI, it’s essential to assess whether these uses genuinely concern the team.
Comparison of Major Office Alternatives to Microsoft 365
| Solution | Type | Online Collaboration | MS Format Compatibility | Sovereign Hosting Possible |
|---|---|---|---|---|
| Google Workspace | Proprietary Cloud | Yes (native) | Good (import/export) | No |
| LibreOffice | Open Source, Local | Limited (via Collabora) | Fair (excluding VBA macros) | Yes |
| ONLYOFFICE | Open Source, Cloud or Local | Yes | Very Good | Yes |
| Nextcloud + Integrated Suite | Open Source, Self-hosted | Yes | Fair | Yes |
| Euro-Office | Open Source, Browser | Yes | To be confirmed (recent version) | Yes |
Google Workspace is suitable for teams accustomed to online collaborative work and less dependent on Excel macros. LibreOffice remains the most accessible solution for individual use without licensing costs. ONLYOFFICE and Nextcloud cater to organizations that want to maintain control over their data while preserving a collaborative environment.
Euro-Office: The European Sovereign Office Suite Launched in 2026
Euro-Office is an open-source office suite accessible via a browser, positioned as a European alternative to Microsoft 365 and Google Workspace. Its first stable version was released on June 9, 2026, making it an option still absent from most comparisons.
The positioning is based on sovereignty: European hosting, open code, GDPR compliance by design. Euro-Office targets the public sector and organizations subject to strict regulatory constraints. Real compatibility with Microsoft formats remains to be tested on complex documents, given the project’s youth.
Criteria for Choosing to Replace Microsoft 365 in Business
Replacing an office suite is not limited to comparing features. Three criteria structure the decision:
- Dependency on existing VBA macros and Excel templates: if the company uses them extensively, ONLYOFFICE or Google Workspace with Apps Script offer more realistic migration paths than LibreOffice
- The need for synchronous collaboration: a five-person firm exchanging attachments does not have the same constraints as a team of forty collaborators working simultaneously on the same documents
- Data localization and applicable legal framework: for structures subject to enhanced GDPR obligations, a self-hosted solution (Nextcloud, ONLYOFFICE) offers control that neither Microsoft 365 nor Google Workspace guarantees in their standard configuration
Each alternative covers the basic office suite foundation. The final choice depends less on the word processor itself than on the ecosystem around it: storage, messaging, videoconferencing, access management. A successful migration starts with an inventory of the tools actually used, not by comparing logos on a homepage.