# European alternatives to Microsoft 365 and Google Workspace

> A practical comparison of European and open-source office suites: GDPR, the CLOUD Act, trade-offs, and a safe migration with Techcroud.

- Source: https://www.techcroud.com/en/blog/european-alternatives-to-microsoft-365-google-workspace
- Author: Karol Barański (https://www.linkedin.com/in/karol-baranski-96529a3/)
- Publisher: techcroud.com Sp. z o.o. (https://www.techcroud.com)
- Published: 2026-08-11
- Updated: 2026-08-11
- Language: en

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Corporate email, calendars, documents, file sharing, chat, and video meetings do not have to run on Google Workspace or Microsoft 365. European suites exist as managed services and as software that can be deployed on infrastructure you control. Some are fully open source, and several were built specifically to give public institutions and businesses greater control over their data.

Switching is not as simple as choosing a product with a “made in Europe” label. You need to examine who owns the provider, which law governs the contract, which subprocessors are involved, where administrative access takes place, who controls encryption keys, how data can be exported, and whether the suite supports the workflows your teams actually use.

This guide compares complete or nearly complete alternatives, explains their advantages and limitations, and proposes a safer migration path. It is not legal advice. For particularly sensitive data, combine the technical assessment with advice from your data protection officer or legal counsel.

## Why an EU server location is not enough

A common shortcut is: “the data is in Frankfurt, so it never leaves Europe.” Data-centre location matters, but it does not answer every relevant question.

You should also establish:

- which legal entity signs the contract and where its parent company is based,
- whether the provider or another group company is subject to third-country law,
- who can remotely access production data, logs, and backups,
- where support teams, administrators, and subprocessors operate,
- who controls encryption keys,
- whether telemetry, spam filtering, AI, mobile notifications, or monitoring use services outside the EEA.

The US CLOUD Act clarified that a provider subject to US jurisdiction may be compelled to produce data in its possession or control regardless of where that data is stored. The US Department of Justice also notes that jurisdiction is not limited to US-incorporated, US-headquartered, or US-owned companies, although it is not unlimited. A reliable “in scope” or “out of scope” conclusion therefore requires analysis of the corporate structure, contract, and service delivery model—not just the map of data centres. See the [US Department of Justice CLOUD Act FAQ](https://www.justice.gov/criminal/media/999616/dl).

From the European perspective, Article 48 GDPR states that a judgment or decision from a third-country authority demanding disclosure cannot automatically be recognised or enforced without a proper basis. The [European Data Protection Board explains how Article 48 should be applied](https://www.edpb.europa.eu/documents/guideline/guidelines-022024-on-article-48-gdpr_en), while its [recommendations on supplementary safeguards](https://www.edpb.europa.eu/documents/recommendation/recommendations-012020-on-measures-that-supplement-transfer-tools-to_en) provide a methodology for assessing international transfers.

The practical conclusion is straightforward: an exclusively European provider or a well-designed self-hosted environment can materially reduce exposure to third-country law. It does not make an organisation invisible to lawful European investigations, nor does it replace the security and accountability controls required by GDPR.

## What counts as a complete alternative

Google Workspace and Microsoft 365 are difficult to replace with a single product because they combine several layers. A credible suite should provide at least:

- email on the company domain, contacts, and shared calendars,
- storage, version history, sharing, and external collaboration,
- collaborative editing of documents, spreadsheets, and presentations,
- chat, audio and video calls, and screen sharing,
- central accounts, MFA, groups, roles, and reliable offboarding,
- audit logs, retention, backup, and recovery,
- open formats, APIs, and a testable data export path.

Not every product below delivers all these functions by itself. In open-source environments, a “suite” often consists of several well-integrated components. That offers more independence, but it also increases architectural and operational responsibility.

## European suites worth evaluating

| Solution | Jurisdiction and model | Main advantage | Main limitation | Best fit |
| --- | --- | --- | --- | --- |
| **openDesk** | Germany; open source; own cloud or data centre | Very broad, integrated toolset with central IAM | Kubernetes-based deployment requires mature operations | public sector, larger organisations, regulated industries |
| **Nextcloud Hub** | Germany; open source; self-hosted or partner-managed | Data control, modularity, and a large ecosystem | Email requires a separate server; quality depends on architecture and operations | organisations building a flexible, controlled stack |
| **Twake Workplace** | France; open source; SaaS or on-premises | Mail, Drive, and Chat in one environment with self-hosting available | Smaller ecosystem; community self-hosting has no official support | teams looking for an integrated French platform |
| **EGroupware** | Germany; open source; cloud or on-premises | Mature groupware for email, calendars, tasks, projects, and files | User experience may require more onboarding | SMEs, universities, project-based organisations |
| **mailbox Suite** | Germany; managed SaaS | Fast adoption, strong email, and a complete core office feature set | Fewer integrations and automations than the largest vendors | small and medium-sized companies wanting a managed service |
| **kSuite** | Switzerland; managed SaaS | Coherent mail, drive, documents, chat, and meeting tools | Switzerland is outside the EEA; no self-hosting option | SMEs seeking a convenient European service |
| **Proton Workspace** | Switzerland; privacy-focused managed SaaS | End-to-end encryption and integrated security tools | Some office and collaboration features are newer | organisations prioritising privacy over complex workflows |

This table is a starting point, not a compliance certificate. Recheck corporate ownership, subprocessors, and the terms of the exact plan before making a decision; those details can change.

### openDesk: the most complete open stack

[openDesk](https://www.opendesk.eu/en/faq) is developed by Germany's Centre for Digital Sovereignty of Public Administration (ZenDiS) on behalf of the Federal Ministry of the Interior. It combines email, calendars, contacts, documents, file storage, chat, video meetings, wiki, notes, projects, tasks, and central identity management.

It is one of the strongest answers to “how do we replace the whole suite?” rather than just email or file storage. The code is open, the components are established, and the platform can run in an organisation's own data centre.

That independence has an operational price. openDesk is a complex Kubernetes platform. A production deployment needs monitoring, security patching, backups, recovery tests, and a skilled operations team. It may be excessive for a small business but attractive to public institutions and larger regulated organisations.

### Nextcloud Hub: the strongest foundation for a controlled environment

[Nextcloud Hub](https://nextcloud.com/platform/) includes Files, Talk, calendars, contacts, a mail client, document editing, and hundreds of additional apps. It can run on-premises, with a European hosting provider, or through a specialist partner. The source code is open and the organisation retains considerable control over where processing occurs.

The key caveat is that the Mail app is a client, not a complete mail service. A full platform also needs a mail server, spam protection, reputation management, archiving, and correct DNS configuration. Document collaboration likewise requires a deliberate choice of office engine.

Nextcloud works best as the core of an engineered environment rather than a one-click installation. Its modularity and replaceable components are major advantages. The trade-off is the need to manage performance, upgrades, and integration compatibility.

### Twake Workplace: a modern French option

[Twake Workplace](https://www.twake.app/index.html), developed by France's LINAGORA, combines Twake Mail, Drive, and Chat with document collaboration and video conferencing. It is available as a hosted service with data in France and as an on-premises deployment.

It is an interesting choice for organisations seeking a single environment and a European provider without needing an ecosystem on the scale of Microsoft or Google. A pilot should cover calendars, mobile devices, external sharing, and complex document editing. Twake's own support information also states that community self-hosting does not receive official technical support.

### EGroupware: mature German groupware

[EGroupware](https://www.egroupware.org/) provides email, calendars, contacts, tasks, projects, files, helpdesk, and collaborative document editing through Collabora Online. It can run in the vendor's German cloud or on infrastructure controlled by the customer.

Its strength is the combination of classic groupware and work management. It is a good candidate when an organisation needs resource planning, tasks, projects, or lightweight CRM processes in addition to documents. The user experience and mobile workflow should still be tested carefully, especially for teams accustomed to Outlook, Teams, or Google Docs.

### mailbox Suite: a pragmatic managed option for smaller businesses

[mailbox Suite for Business](https://kb.mailbox.org/en/business/faq/mailbox-for-business/) provides company-domain email, address books, calendars, tasks, Drive, and online document editing. The service is managed in Germany and business customers can enter into a data processing agreement.

It is a practical alternative for companies that do not want to operate their own servers. The trade-off is a smaller catalogue of integrations, automations, device management features, and extensions than Microsoft 365. A pilot should cover shared mailboxes, delegation, calendars, video meetings, and mobile work.

### kSuite and Proton Workspace: European, but outside the EEA

Swiss products are European geographically and independent of US law at the provider level, but Switzerland is neither an EU member nor part of the EEA. That distinction should not be hidden under the phrase “European cloud.”

[Infomaniak kSuite](https://www.infomaniak.com/en/support/faq/2423/getting-started-ksuite) combines email, kDrive, online documents, calendars, contacts, kChat, and kMeet. It is a convenient managed suite for SMEs, but it cannot be deployed on the customer's own server.

[Proton Workspace](https://proton.me/support/proton-for-business) includes Mail, Calendar, Drive, Docs, Sheets, Meet, Pass, and VPN. End-to-end encryption and limited provider access to content are its main differentiators. It is a strong option where confidentiality matters more than advanced macros, automations, and compatibility with every established workflow. Docs, Sheets, and Meet are younger products, so they should be tested with real files and meetings before migration.

## Advantages of a European and open stack

### Greater control over the processing chain

It is easier to design an environment where the provider, hosting, administrators, and backups remain in the EU or EEA. With self-hosting, an organisation can also control keys, logs, and administrative access policies.

### Less dependence on one vendor

Open standards such as WebDAV, CalDAV, CardDAV, IMAP, SMTP, and OpenDocument formats make migration and integration easier. They do not eliminate dependency, but they increase the number of viable exit paths.

### The ability to audit and adapt

Open source allows the organisation or its partner to inspect behaviour, remove unnecessary integrations, and build extensions. Source availability alone does not create security; regular patching, configuration review, and vulnerability response remain essential.

### Protection aligned with data sensitivity

Marketing assets do not need the same treatment as health, legal, children's, or trade-secret data. A controlled European stack makes it easier to create several processing classes instead of sending everything to one global platform.

## Limitations that should be discussed before migration

### File compatibility will not always be perfect

Ordinary documents, spreadsheets, and presentations usually work well. Problems are more likely with advanced VBA macros, Office add-ins, custom fonts, complex layouts, Power Query, or spreadsheets acting as business applications. These files should be identified before migration.

### Integrations will not move automatically

Entra ID or Google sign-in, forms, bots, Power Automate flows, Outlook add-ins, room booking, CRM systems, and mobile device policies may require reconfiguration or a new integration.

### Self-hosting creates responsibility

An own server is not private if nobody installs patches, monitors logs, or tests backups. The operating model must cover SLA, monitoring, upgrades, mail security, incident response, and recovery.

### A smaller ecosystem can mean more user effort

The largest vendors offer polished mobile apps, accessibility features, training, documentation, and thousands of integrations. A European alternative may execute the primary workflow well while missing one small feature that is critical to a particular department.

## How to choose without marketing shortcuts

Before requesting prices, build a requirements matrix. For every candidate, verify:

1. **Jurisdiction:** ownership, corporate group, governing law, and potential reach of third-country law.
2. **Data flows:** primary and backup hosting, support, telemetry, spam filtering, AI, CDN, and all subprocessors.
3. **Security:** MFA, SSO, roles, logs, encryption, key control, retention, DLP, archiving, and incident response.
4. **Portability:** documented export of mail, calendars, contacts, files, versions, chats, and permissions.
5. **Continuity:** SLA, monitoring, RPO, RTO, production-independent backups, and recovery testing.
6. **Functional fit:** real documents, shared mailboxes, delegation, rooms, phones, client meetings, and critical integrations.
7. **Total cost:** licences or subscriptions, hosting, implementation, operations, migration, training, and integration work.

A European provider is not automatically GDPR-compliant, and a US product is not automatically non-compliant. The difference lies in the risk profile, available controls, and the number of supplementary measures that must be assessed and documented. For particularly sensitive processing, see the [French CNIL's recommendation to consider providers exclusively subject to European law](https://www.cnil.fr/en/cloud-risks-european-certification-allowing-foreign-authorities-access-sensitive-data).

## Safer migration starts with a pilot, not a shutdown

### Phase 1: inventory

Collect accounts, aliases, groups, shared mailboxes, calendars, resources, storage volumes, permissions, OAuth applications, devices, and automated flows. Mark sensitive data and processes whose interruption would stop the business.

### Phase 2: proof of concept

A representative group works with real documents and workflows for several weeks. Include people from management, sales, finance, operations, and IT—not only early adopters.

### Phase 3: migration in waves

Move lower-risk teams first and integration-heavy departments later. Email needs its own plan for routing, incremental synchronisation, DNS changes, and rollback. We cover transition patterns in [One domain, two mail systems: split delivery](/en/blog/one-domain-two-mail-systems-split-delivery) and [Dual delivery: safe migration or double chaos?](/en/blog/dual-delivery-safe-migration-or-double-chaos).

### Phase 4: stabilisation and exit

After migration, monitor mail delivery, login errors, device synchronisation, performance, and support tickets. Retire the old platform only after validating data completeness, retention, backups, and recovery procedures.

## How Techcroud supports European collaboration systems

Techcroud supports organisations that want to reduce their dependence on global platforms and build an environment aligned with their actual risk. We do not assume that one brand fits every company. We start with data, processes, and requirements.

We can help with:

- auditing an existing Microsoft 365, Google Workspace, or mixed environment,
- analysing jurisdiction, subprocessors, and technical data flows together with the customer's DPO or legal counsel,
- comparing openDesk, Nextcloud, Twake, EGroupware, and managed European services,
- designing EU hosting, backups, monitoring, SSO, MFA, and audit logging,
- piloting real documents, devices, and integrations,
- migrating email, calendars, contacts, files, and permissions,
- preparing cutover, communications, training, and rollback plans,
- operating updates, monitoring, backups, and user support after launch.

A hybrid model is also possible. A company does not need to move everything on one day or replace every tool with one product. It can begin with sensitive files, internal communication, or a selected department and make further decisions based on pilot results.

## Summary

European alternatives to Microsoft 365 and Google Workspace are real, but they are not always a single box. mailbox Suite or kSuite may be the best fit for a smaller company. A privacy-first organisation may choose Proton Workspace. A company seeking full control can build on Nextcloud Hub or EGroupware, while a larger institution may consider openDesk.

The most important question is not which product shows the most icons on its website. It is who controls the data, keys, and administrative access; whether there is a credible exit plan; and whether employees can complete their daily work in the new environment.

If you want to assess a move to a European or open-source stack, see our [IT Partner service](/en/it-partner). Techcroud can prepare the inventory, shortlist, pilot, and migration plan without disrupting critical business processes.