Setting up Thunderbird Lightning with CalDAV

Step 1 - Open Thunderbird
Step 2 - Create a new Calendar
Step 3 - Select where your calendar is stored
Step 4 - Open Webmail
Step 5 - Copy the CalDAV url
Step 6 - Configure new calendar
Step 7 - Select name and color
Step 8 - Finish setup
Step 9 - Create an event in Webmail
Step 10 - Synchronize in Thunderbird
Step 11 - All done!

This guide shows you how to set up your One.com calendar in Thunderbird so that events are automatically synced.

Before you continue, please check that you have Thunderbird with the Lightning plugin installed.

Note: You can only set up calendars for one email account at a time. It's possible to set up multiple calendars on the same account, but you can't simultaneously sync calendars from other email accounts.

Step 1 - Open Thunderbird

Open Thunderbird and click the Calendar tab at the top of the screen, or click the calendar icon to the right.


Open Thunderbird

Step 2 - Create a new Calendar

Right click on an existing calendar and select New Calendar... in the menu that appears.


Go to the calendar tab in Thunderbird

Step 3 - Select where your calendar is stored

Select On the network and click Next.


Choose on the network

Step 4 - Open Webmail

Log in to Webmail and click on the cog wheel next to the calendar you want to set up. Under Calendar options, click Show CalDAV url.


In Webmail go to settings for your default calendar

Step 5 - Copy the CalDAV url

Copy the unique CalDAV url for your calendar and go back to Thunderbird.


Copy the CalDAV url in Webmail

Step 6 - Configure new calendar

Select CalDAV under format and paste in the CalDAV url for Location. Click Next to continue.


Choose CalDav under format and copy in the CalDAV url

Step 7 - Select name and color

Enter a name for your calendar and select a color and click Next.


Enter a name for your calendar and select a color

Step 8 - Finish setup

Your calendar has now been created, click Finish to close.

Note: Sometimes you need to confirm your login details. Enter your email address and password when asked.
Your new calendar is now set up

Step 9 - Create an event in Webmail

To make sure everything is set up correctly, create an event in Webmail, in the calendar you have just set up.


Open Webmail and create an event in your default calendar

Step 10 - Synchronize in Thunderbird

Go back to Thunderbird and click Synchronize in the top left corner.


Click synchronize in the top left corner

Step 11 - All done!

The event you just created in Webmail should now appear in your calendar in Thunderbird. If the calendar doesn't sync properly, please check your settings and try again.


The event you created in Webmail is now visible in Thunderbird

Related articles:

What is CalDAV?
Getting started with One.com Calendar