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EGroupware

EGroupware is an Open Source software for business use and provides the services which allow organisations to collaborate in a secure and function rich environment, supporting integrated project teams across and within organisation boundaries.

DAVdroid setup

CalDAV/CardDAV URL: /groupdav.php (e.g. https://server.example/egroupware/groupdav.php)

No contact group support. Choose "per-contact categories" as contact group method to minimize problems.