5 European alternatives · updated 12 October 2026 · How we select
Microsoft 365’s optional EU data residency leaves many teams exposed to US access laws, while smaller users pay for features they never touch. Collabora Online and ONLYOFFICE offer open-source office suites with EU hosting and full Office compatibility, without the lock-in.
Microsoft 365 covers documents, email, calendar, storage and meetings. European alternatives: Collabora Online, mailbox.org, Infomaniak kSuite, ONLYOFFICE and LibreOffice. By area: Collabora Online, Infomaniak kSuite and ONLYOFFICE for documents; mailbox.org and Infomaniak kSuite for email; mailbox.org and Infomaniak kSuite for calendar; mailbox.org and Infomaniak kSuite for storage; Infomaniak kSuite for meetings.
Open-source, browser-based office suite with EU hosting and Nextcloud integration
Replaces Word, Excel and PowerPoint with a browser-based editor; no email, calendar or storage.
Berlin-based encrypted email, calendar and cloud storage with PGP in the browser and German servers only.
Replaces Outlook, Exchange and OneDrive with encrypted email, calendar and storage; no documents.
Collaborative office suite with OnlyOffice, chat, calls and email
Replaces Microsoft 365 fully with documents, email, calendar, storage and meetings in one suite.
Open-source office suite with EU hosting and full Microsoft Office compatibility
Replaces Word, Excel and PowerPoint with a Microsoft-compatible editor; no email, calendar or storage.
Free, open-source office suite with full document control and no vendor lock-in.
Replaces Word, Excel and PowerPoint with a desktop suite; no email, calendar or storage.
Which part of Microsoft 365 each alternative covers.
| Provider | Documents | Calendar | Storage | Meetings | From | Rating | Import from Microsoft 365 | |
|---|---|---|---|---|---|---|---|---|
| Microsoft 365 (the tool you are replacing) | ✓ | ✓ | ✓ | ✓ | ✓ | – | ★ 4.6 | – |
| Collabora Online 🇬🇧 | ✓ | €3 | ★ 4.7 (102) | – | ||||
| mailbox.org 🇩🇪 | ✓ | ✓ | ✓ | €12/mo | ★ 4.3 (125) | ✓ service | ||
| Infomaniak kSuite 🇨🇭 | ✓ | ✓ | ✓ | ✓ | ✓ | CHF 7.33 | ★ 4.5 (3) | ✓ built-in |
| ONLYOFFICE 🇱🇻 | ✓ | On request | ★ 4.4 (600) | – | ||||
| LibreOffice 🇩🇪 | ✓ | On request | ★ 4.3 (2855) | – |
Prices per user and month in the cheapest paid plan. Ratings are weighted across G2, Capterra, OMR and other portals, with the review count in brackets.
What to know about the tool you are replacing, with sources.
Sources: microsoft.com · go.microsoft.com · g2.com · capterra.com · researched 6 October 2026
Microsoft 365 exports your data as PST, CSV, XML, HTML and Native documents, and its API can read everything out. Infomaniak kSuite imports Microsoft 365 content with a built-in importer. With help from the vendor: mailbox.org. Every import above links its source on the product card.
Infomaniak kSuite is the only listed European suite that covers documents, email, calendar, storage and meetings. It integrates OnlyOffice for editing and offers a free forever plan.
mailbox.org provides encrypted email and calendar with German server location. It offers a migration service for importing data from Microsoft 365.
Infomaniak kSuite and mailbox.org store data in Europe and are designed for GDPR compliance. Collabora Online and ONLYOFFICE offer EU hosting options to support GDPR requirements.
Collabora Online and Infomaniak kSuite offer free plans. ONLYOFFICE and LibreOffice are open source and free to use.