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Best European alternatives to Kolab in 2026

We found 1 EU-built alternative to Kolab — GDPR-native, with verified data sovereignty and transparent rankings. No pay-to-win.

1 EU-built alternative to Kolab

Ox Open Xchage

Email Marketing

EU Based

OX App Suite is a web-based collaboration platform by Open-Xchange offering email, calendar, contacts, cloud storage and productivity tools. It supports self-hosting and SaaS deployment, scales to millions of users, and includes end-to-end encryption via OX Guard.

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