DAVx⁵ has been successfully tested with 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.

DAVx⁵ settings

Base URL: /groupdav.php (e.g.

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