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Best European alternatives to Zimbra in 2026

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

1 EU-built alternative to Zimbra

Kolab

Project Management

EU Mentions

Kolab is a fully open-source groupware and collaboration suite that can be self-hosted. It offers email, calendar, contacts, and file sharing with support for CalDAV, CardDAV, IMAP, and WebDAV standards.

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