EU Alternatives to Microsoft 365: A Realistic Comparison for Organisations Ready to Switch

Organisations searching for European alternatives to Microsoft 365 usually find two kinds of content: vendor marketing pages that claim full feature parity, and Reddit threads from frustrated sysadmins who tried to switch and gave up. Neither is useful for making a real decision.

This post provides a service-by-service comparison of the most credible European alternatives to each component of Microsoft 365. For each one, we assess feature parity, maturity, hosting options, and the realistic effort required to switch. No affiliate links. No vendor partnerships.

The Microsoft 365 Stack, Decomposed

Microsoft 365 is not a single product. It is a bundle of at least 10 distinct services, each with its own alternatives and its own migration complexity. The services that matter most for dependency purposes:

Identity: Azure AD / Entra ID

This is the layer that matters most. Every other migration depends on it.

Keycloak

• Origin: Open source, maintained by Red Hat (IBM subsidiary, US-headquartered, but Keycloak is Apache 2.0 licensed and can be self-hosted on EU infrastructure)
• Protocols: SAML 2.0, OpenID Connect, OAuth 2.0, LDAP
• Conditional access: Supported through authentication flows and custom policies. Less polished than Entra ID’s UI, but functionally equivalent for most use cases.
• MFA: Built-in support for TOTP, WebAuthn/FIDO2, and SMS. No push-based MFA equivalent to Microsoft Authenticator prompts without third-party integration.
• Device management: Not included. Keycloak handles authentication, not device compliance. Pair with a separate MDM solution.
• Maturity: Production-ready. Used by government agencies, universities, and enterprises across Europe. Large community. Extensive documentation.
• Hosting: Self-hosted or through managed Keycloak providers (Bare.ID in Germany, Phase Two in the US).

Verdict: The strongest open-source alternative. Handles identity federation well. Requires operational investment to run and maintain. Not a drop-in replacement for the full Entra ID feature set (especially device management and conditional access based on device compliance state).

Authentik

• Origin: Open source, founded in the Netherlands
• Protocols: SAML 2.0, OpenID Connect, OAuth 2.0, LDAP, SCIM
• Conditional access: Policy engine with conditional checks (IP, device, group membership)
• MFA: TOTP, WebAuthn, SMS, email-based
• Maturity: Younger than Keycloak but growing rapidly. Good UI. Docker-native deployment.
• Hosting: Self-hosted. No managed offering from the project itself.

Verdict: A modern, well-designed alternative. Better developer experience than Keycloak for smaller teams. Less battle-tested at enterprise scale.

Kanidm

• Origin: Open source, written in Rust
• Protocols: OAuth 2.0, OpenID Connect, LDAP (read-only), RADIUS
• Maturity: Relatively young. Strong security focus. Best suited for technically sophisticated teams.

Verdict: Promising for security-conscious organisations willing to invest in early-stage software. Not yet a practical choice for most mid-market organisations.

Email: Exchange Online

Proton Mail for Business

• Origin: Swiss (Proton AG, Geneva)
• Encryption: End-to-end encryption by default. Zero-access encryption on the server.
• Calendar: Proton Calendar with encrypted event storage. Supports CalDAV.
• Contacts: Encrypted contacts. Supports CardDAV.
• Admin console: Available. User management, domain management, catch-all addresses.
• Migration tools: Proton offers an Easy Switch tool that imports from Gmail and Outlook. IMAP import supported.
• Limitations: No native shared mailboxes as of early 2026. No public folder equivalent. Limited mail flow rule customisation compared to Exchange.

Verdict: The best choice for organisations that prioritise encryption and do not need complex shared mailbox configurations. Swiss jurisdiction provides strong legal protection. Growing enterprise feature set.

Tuta (formerly Tutanota)

• Origin: German (Tuta GmbH, Hanover)
• Encryption: End-to-end encryption. Custom protocol (not PGP).
• Calendar: Built-in encrypted calendar.
• Limitations: No IMAP/SMTP support (by design, to maintain encryption). No CalDAV/CardDAV. This means no third-party email client integration. You must use Tuta’s own clients.
• Admin console: Available for Tuta Teams plans.

Verdict: Strongest encryption stance, but the lack of IMAP/SMTP and CalDAV limits interoperability. Best for organisations willing to use Tuta’s clients exclusively.

Open-Xchange (OX App Suite)

• Origin: German (Open-Xchange GmbH, Nuremberg)
• Deployment: Primarily sold through hosting partners (1&1, T-Online, and other European telcos). Also available for self-hosting.
• Features: Email, calendar, contacts, Drive (file storage), Documents (collaborative editing). Full groupware suite.
• Protocols: IMAP, SMTP, CalDAV, CardDAV, WebDAV
• Maturity: Used by tens of millions of European email users through telco partnerships.

Verdict: A full-featured groupware suite with a strong European footprint. Best suited for organisations that want a managed European email service through a hosting partner. The enterprise self-hosted option requires significant infrastructure investment.

Mailcow

• Origin: Open source (German community-maintained)
• Deployment: Self-hosted via Docker
• Features: Full mail server with SOGo groupware (email, calendar, contacts), rspamd for spam filtering, ClamAV for virus scanning, DKIM/DMARC support
• Admin console: Web-based admin UI with per-domain and per-user management

Verdict: Excellent for technically capable teams that want full control. Requires a dedicated server and ongoing maintenance. Not suitable for organisations without in-house sysadmin capacity.

File Storage: SharePoint / OneDrive

Nextcloud

• Origin: German (Nextcloud GmbH, Stuttgart). Fork of ownCloud, founded by Frank Karlitschek in 2016.
• Features: File sync and share, collaborative editing (via Collabora Online or ONLYOFFICE), Talk (chat and video), Groupware (calendar, contacts, mail), Deck (kanban boards), Forms, and hundreds of apps.
• Deployment: Self-hosted or through managed Nextcloud providers (Hetzner, IONOS, OVHcloud, and dozens of EU hosting companies).
• Collaborative editing: Nextcloud Office (Collabora Online) provides LibreOffice-based document editing in the browser. ONLYOFFICE integration is also available. Neither matches Google Docs or Microsoft 365 for real-time co-editing performance, but both are functional for typical use.
• SharePoint replacement: Nextcloud does not replicate SharePoint’s intranet, list, or workflow features. It replaces the file storage and collaboration aspects. Organisations that use SharePoint as an intranet or document management system will need a separate solution for those functions.

Verdict: The most widely deployed European alternative to OneDrive/SharePoint for file storage. Strong integration ecosystem. The collaborative editing experience is improving but remains a step behind Microsoft and Google. EU-hosted managed instances are widely available and affordable.

ONLYOFFICE

• Origin: Latvian (Ascensio System SIA, Riga)
• Features: Document, spreadsheet, and presentation editing with high Microsoft Office format compatibility. Available as a self-hosted Docs Server or as ONLYOFFICE Workspace (integrated with file storage, mail, calendar, CRM, projects).
• MS Office compatibility: The best among open-source editors. Complex .docx and .xlsx files render more accurately in ONLYOFFICE than in LibreOffice or Collabora.

Verdict: The best choice if Microsoft Office format compatibility is a top priority. Can be deployed alongside Nextcloud or as a standalone workspace.

Chat and Video: Microsoft Teams

Element (Matrix)

• Origin: UK (Element, formerly New Vector Ltd). Matrix protocol is open standard.
• Deployment: Self-hosted (Synapse or Dendrite homeserver) or Element Cloud (hosted by Element).
• Features: End-to-end encrypted messaging, channels (Spaces), voice and video calls, file sharing, threads.
• Federation: Matrix is a federated protocol. Different organisations can run their own homeservers and communicate across them, like email. No other chat platform offers this.
• Government adoption: Used by the French government (Tchap), the German armed forces (BwMessenger), and NATO.
• Limitations: Video conferencing is less polished than Teams or Zoom. Large-scale video calls (50+ participants) require additional infrastructure (Jitsi or LiveKit integration). The UI has improved significantly but still feels less refined than Teams for non-technical users.

Verdict: The strongest choice for organisations that value encryption, federation, and sovereignty. Government adoption provides credibility. The video experience is the main gap.

Rocket.Chat

• Origin: Originally Brazilian, now US-headquartered. Open source, self-hostable.
• Features: Chat, channels, video calls, file sharing, bots, marketplace for integrations.
• Deployment: Self-hosted or Rocket.Chat Cloud.

Verdict: Feature-rich and mature. The US headquarters is a consideration for organisations focused on EU jurisdiction, but self-hosting on EU infrastructure addresses the data residency concern.

Nextcloud Talk

• Origin: German (part of Nextcloud)
• Features: Chat, video calls, screen sharing, file sharing. Integrated with Nextcloud Files.
• Limitations: Less feature-rich than Teams or Element for large organisations. Best suited as a complement to Nextcloud Files rather than a standalone communication platform.

Verdict: Good for organisations already using Nextcloud. Not a full Teams replacement on its own.

Workflow Automation: Power Automate

n8n

• Origin: German (n8n GmbH, Berlin). Source-available (fair-code licence), self-hostable.
• Features: Visual workflow builder with 400+ integrations. Supports webhooks, HTTP requests, and custom JavaScript/Python nodes.
• Deployment: Self-hosted (Docker, Kubernetes) or n8n Cloud.

Verdict: The closest equivalent to Power Automate in the European ecosystem. Capable of replacing most Power Automate workflows. The fair-code licence allows self-hosting for organisations with fewer than a certain number of workflow executions (check current terms).

Activepieces

• Origin: Open source (MIT licence). Company based in the US but fully self-hostable.
• Features: Visual workflow builder, growing integration library.

Verdict: Younger than n8n but fully open source with no licence restrictions on self-hosting.

Device Management: Intune

This is the area with the fewest European alternatives.

Fleet (fleetdm.com)

• Origin: US, but open source (MIT licence) and self-hostable.
• Features: Endpoint visibility, osquery-based. Device management for macOS, Windows, Linux.

Other options

• Jamf (US) for macOS-heavy environments
• Custom MDM with MicroMDM (open source) for macOS
• Univention Corporate Server (German) for directory and device policy management in Linux environments

Verdict: No single European product matches Intune’s breadth. Organisations with heterogeneous device fleets will likely need to combine multiple tools. This is one of the genuine gaps in the European software ecosystem.

The Honest Assessment

A complete Microsoft 365 replacement using European alternatives is possible. It requires assembling multiple products where Microsoft offers one bundle:

The gaps are real but narrowing. For most organisations with 5 to 50 employees, the available European alternatives cover the core needs. The remaining gaps are in enterprise features that many mid-market organisations do not use.

The practical question is not “is there a perfect 1:1 replacement?” The answer is no. The practical question is “can we run our business on these alternatives?” For a growing number of European organisations, the answer is yes.

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