DAVx⁵ has been successfully tested with Zoho One.

Zoho One is a all-in-one suite to run your entire business. It includes CalDAV calendars and CardDAV contacts.

DAVx⁵ settings

CalDAV Base URL:https://calendar.zoho.com/

CardDAV Base URL:https://contacts.zoho.com/

User name and pasword: your Zoho email address and password

Known problems

CardDAV: VCard contact groups are not supported. Choose the method used by your other clients or "per-contact categories" to minimize potential problems.

CalDAV: VTODO tasks don't seem to be supported by Zoho.

Last updated: 30 Dec 2018