2 EU-built alternatives to Zimbra
Ox Open Xchage
Email MarketingOX 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.
DE
Kolab
Project ManagementKolab 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.
CH
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