CalDAV

New in Tiki21: CalDAV support in Tiki Calendar via SabreDAV. See also CardDAV and Calendar Invitations by email.

CalDAV URL is http://example.org/tiki-caldav.php but you should point to the base URL and let your CalDAV client auto-detect settings.
If you need to connect your Tiki calendar and your client manually, use the following syntax of your credentials:
url: https://example.com/tiki-caldav.php/calendars/USERNAME/calendar-ID
user: USERNAME
password: PASSWORD

Adding a Tiki calendar to Thunderbird in 3 minutes

(basic setup)

1. open the calendar tab in Thunderbird
2. create a new calendar, choose the option 'network', confirm
3. choose the option CalDav and provide your USERNAME and the url (your Tikis CalDav-address like https://example.com/tiki-caldav.php/calendars/USERNAME/calendar-ID), confirm
4. choose a name for the calendar to be displayed in Thunderbirds calendar list and a color for this calendars items/events, providing an email is optional, confirm
5. your calendar is now setup, confirm
6. activate the calendar by providing your username and password (accept to be stored on the local machine), confirm

That's pretty much everything

Related: Webmail

This development was done as part of Email as a first-class citizen