EU sovereignBusiness Email & GroupwareHeadquarters: CH

Kolab: sovereignty score and 8 European alternatives

Kolab is open-source email and groupware software that has been available since 2003. It covers email, calendar, contacts, files, tasks, notes and voice and video communication, accessible through a web interface or existing mobile and desktop clients. According to the project, Kolab can be completely self-hosted, so organisations keep control over their data. There is also Kolab Now, a hosted service that includes file storage and collaborative editing through Collabora.

Kolab is developed and supported by Apheleia IT AG, a company registered in Switzerland that was formerly called Kolab Systems AG. Kolab Now is hosted in Switzerland, and under its terms third parties can access user data only with a warrant issued by a Swiss judge. Switzerland is not an EU member state but belongs to EFTA. Because the software is open source, you can also install Kolab on your own servers in the EU. A European organisation can therefore choose between a vendor-operated service under Swiss law and self-hosting.

See the 8 European alternatives ↓Assess your stack with Kolab pre-selected

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Sovereignty score

90 / 1000 = high exposure
100 = sovereign

Jurisdiction SOV-2100
Headquartered in Switzerland: Swiss law, recognised by the EU as adequate
Data residency SOV-380
Hosting in Switzerland only (recognised by the EU as adequate)
Cryptographic key sovereignty SOV-390
Self-hostable: encryption keys under your own control
Freedom from lock-in SOV-680
Open source: low switching costs
Source & runtime sovereignty SOV-4 · SOV-6100
Source code auditable, forkable and self-hostable

SOV codes: the matching objective in the European Commission's Cloud Sovereignty Framework. Official source

How the score is calculated

Facts and evidence

Last checked October 9, 2026

Headquarters	CH (EU)Verified by hand
Sovereignty model	Vendor-hosted (EU)Verified by hand
Data hosting	CHVerified by hand
Open-source	YesVerified by hand
GDPR-compliant	YesVendor-stated
Hosting signal	NTS - NTS workspace AG, CH (CH)Technically measured
Category	Business Email & Groupware
Type	Product
Website	kolab.org ↗

The hosting signal shows the network that serves the vendor's website, often a CDN, and not necessarily where the service or your data is hosted. How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to Kolab

The European alternatives to Kolab come from our knowledge base of over 6,800 vendors. We only list vendors headquartered in the EU or the EEA; fully European-owned vendors rank before vendors with a foreign owner. For each alternative you see the country, the open-source status and a short description.

Score per alternative: 0 = high exposure, 100 = sovereign

28 European Business Email & Groupware vendors are in the catalogue. View the whole category · Submit an alternative · View category on the map

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Why digital sovereignty matters with Kolab

Kolab is headquartered in Switzerland and falls under Swiss law, including the revised Swiss data protection act. Switzerland is not an EU member, but the European Commission recognises its level of data protection as adequate. Its Swiss headquarters does not by itself bring it under US legislation such as the CLOUD Act.

Kolab hosts data in Switzerland only. Switzerland is not part of the EU or the EEA, so the GDPR does not apply there directly; the European Commission does recognise Swiss data protection as adequate, so personal data can go there without extra safeguards. Our model therefore scores it between EU hosting and hosting outside Europe. If you require strictly EU hosting, take this into account.

Kolab is open source. You can audit the source code, self-host the software and keep the encryption keys under your own control. Switching is easier because data and software are not tied to a single party.

What this means for your organisation depends on your whole stack and context. The free assessment weighs Kolab together with your other vendors and gives a total score, a heatmap and the main risk drivers.

Frequently asked questions

What is the best European alternative to Kolab?

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

Are there open-source alternatives to Kolab?

Yes. Open-source EU alternatives to Kolab include Benno MailArchiv, CipherMail, Dovecot and EGroupware. These keep your data fully under your own control and let you self-host if you want to.

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

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

Details and sources

Verified by handHeadquarters, owner, hosting locations and licence have been checked by us against public sources. Free of charge and for every vendor, not a paid label. Nothing in this knowledge base is taken over automatically. Last checked on October 9, 2026.

Sources

Public sources used in the latest check of this record.

Compliance evidence

The links below point to the vendor's own public documents. We only record what we found: a missing link means "not found publicly", not "not compliant".

No public compliance evidence has been recorded for this vendor yet. Do you know its DPA or subprocessor list? Something wrong? Suggest a correction

Digital sovereignty in Business Email & Groupware

Business Email & Groupware: Business email servers, groupware, calendar and contact management. In this category the choice of vendor determines who has legal access to your data, where that data lives and how easily you can switch later.

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