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openCRX

Synchronize openCRX contacts and calendars with your Android device using DAVdroid!

openCRX is a professional enterprise-class open-source CRM solution.

DAVdroid setup

CalDAV/CardDAV URLs: see Wizards / Connection Helper / Profiles / Calendar/Card Profile

openCRX CalDAV/CardDAV collections are read-only by default, but are not flagged as read-only.

Enable read/write access for DAVdroid, or adding/changing entries will fail.