Category: Business Email & Groupware

8 European alternatives to grommunio — GDPR-compliant & EU-hosted.

Austrian open-source groupware platform as an alternative to Microsoft Exchange

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Facts

Headquarters: AT (EU)
Category: Business Email & Groupware
Type: Product
GDPR-compliant: Yes
Open-source: Yes
Data hosting: EU

Top EU-based & GDPR-compliant alternatives to grommunio

Axigen
Romanian enterprise email server with webmail, calendar and instant messaging
RO · commercial
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EGroupware
German open-source groupware platform with email, CRM, project management and more
DE · open-source
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Kolab
Swiss open-source groupware platform with email, calendar and file management
CH · open-source
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Kopano
Kopano Cloud is the proprietary successor to Kopano Groupware, which reached end-of-life on March 31, 2025. The open-source Kopano Groupware (AGPL) is no longer maintained; Kopano Cloud is available under a commercial/proprietary license only.
NL · commercial
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Mailcow
German open-source email server platform with Docker-based installation
DE · open-source
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Mailu
Open-source email server in Docker with webmail, anti-spam and antivirus protection
FR · open-source
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Open-Xchange
German open-source email and groupware platform for providers and companies
DE · open-source
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Roundcube
open-source webmail-client with modern interface and plugin-architecture
CH · open-source
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Frequently asked questions

What is the best European alternative to grommunio?

It depends on your use case. Strong EU alternatives to grommunio include Axigen, EGroupware and Kolab. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to grommunio?

Yes. Open-source EU alternatives to grommunio include EGroupware, Kolab, Mailcow, Mailu, Open-Xchange and Roundcube. These keep your data fully under your own control and let you self-host if you want to.

Is grommunio GDPR-compliant and where is the data hosted?

grommunio is headquartered in AT (EU) and hosts data in EU. It is also open-source, so you can self-host it. That makes grommunio an EU-sovereign choice in its own right; the EU alternatives on this page are comparable European tools.

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