Setting up Thunderbird with CalDAV on Windows

This guide shows you how to set up your one.com calendar in Thunderbird on Windows to sync events automatically.

Note: Calendar functionality (previously provided by the Lightning add-on) has been included in Thunderbird by default since version 78 and remains available in all later versions. You don’t need to install a separate plugin to sync your CalDAV calendar.

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 - Enter your email password
Step 8 - Select name and color
Step 9 - Subscribe to the calendar
Step 10 - The setup is finished
Step 11 - Create an event in Webmail
Step 12 - Synchronize in Thunderbird
Step 13 - All done!

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Step 1 - Open Thunderbird

Open Thunderbird and click the Calendar icon on the left side on the screen.

Screenshot with a red arrow pointing to the Calendar icon in Thunderbird.

Step 2 - Create a new Calendar

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

Screenshot with a red arrow pointing to the "New Calendar..." option in the menu.

Step 3 - Select where your calendar is stored

Select On the Network and click Next.

Screenshot with a red arrow showing to select "On the Network" and then click "Next".

Step 4 - Open Webmail

Log in to Webmail and click the Calendar icon in the menu in the left.
Click the cogwheel next to the calendar you want to set up. Under Calendar options, click Show CalDAV url.

Screenshot with a red arrow pointing to the cogwheel and the "Show CalDAV URL" option in Webmail.

Step 5 - Copy the CalDAV url

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

Screenshot with a red arrow pointing to the CalDAV URL to copy.

Step 6 - Configure new calendar

Enter the following details:

Username: the email address associated with the calendar.
Location: the CalDAV URL you copied from your one.com Webmail.
Click Find Calendars.

Screenshot of Thunderbird showing the "Create New Calendar" dialog. The Username and Location fields are highlighted, and a red arrow points to the "Find Calendars" button.

Step 7 - Enter your email password

Enter your email password and click OK.

Screenshot of Thunderbird showing the "Authentication Required" dialog. A red arrow points to the password field, and another red arrow points to the "OK" button.

Step 8 - Select a name and color

Click the Properties button and choose a name and a color for your calendar and click OK to save.

Screenshot of Thunderbird showing the "Create New Calendar" dialog. A red arrow points to the "Properties" button, which you click to choose a name and a color for your calendar.

Step 9 - Subscribe to the calendar

Make sure the calendar is checked and click Subscribe.

Screenshot of Thunderbird showing the "Create New Calendar" dialog. A red arrow points to the checkbox to select a calendar, and another red arrow points to the "Subscribe" button.

Step 10 - The setup is finished

Your calendar has now been added.

Screenshot of Thunderbird showing the calendar view with a new CalDAV calendar successfully added and events displayed in the calendar.

Step 11 - 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.

Screenshot of Webmail calendar showing a new event created. A red arrow points to the event entry in the calendar view.

Step 12 - Synchronize in Thunderbird

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

Screenshot of Thunderbird showing the calendar view. A red arrow points to the "Synchronize" button in the top left corner, which must be clicked to update the calendar.

Step 13 - 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.

Screenshot of Thunderbird showing the calendar view. A red arrow points to the event created in Webmail, now visible in Thunderbird after synchronization.

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