How to use Thunderbird Mozilla Lightning Calendar WebDAV/ICS access to Horde Calendar (Kronolith)

Follow these steps for subscribing to Mozilla Lightning Calendar with Kronolith:

Note: As of Thunderbird 78 Lightning has been integrated into Thunderbird

• Open your calendar in Horde webmail:
  For the purposes of this demonstration, we assume your domain is "yourdomain.com", so the Webmail URL would be: https://webmail.yourdomain.com.
• CLick on My Calendars: You will see a list of all your calendars .
• Click on the calendar name you want to work with in the left menu, then on the Pencil icon to Edit it.
• Click on the "Subscription" tab.
• Copy the WebDAV/ICS Subscription URL

For the purposes of this demonstration, we assume that it says "https://yourdomain.com/horde/rpc.php/kronolith/postmaster@yourdomain.com.ics".

Then:

OpenThunderbird:

• Click on the Calendar icon.
• Create a new calendar by clicking the Plus sign in the list of accounts.
• Select location: On the network.
  Username: the full email address, i.e. postmaster@yourserver.org
  Location: the WebDAV/ICS Subscription URL above, i.e. https://yourdomain.com/horde/rpc.php/kronolith/postmaster@yourserver.org.ics"
• Click on Find calendars.
• When prompted: enter your account password.
• Check the box to save the password.
• Click on Sign-In.
• Click on Subscribe.

That's it! You will see the new calendar has been added to the list of calendars in Thunderbird/Sunbird.