Synchronising contacts and calendars
When using CardDAV/CalDAV with external applications such as DAVx⁵, Outlook, or Thunderbird, you must create and use an application password instead of your regular mailbox password.
For detailed instructions, please see the following article:
Create and manage application passwords
CalDAV and CardDAV – Overview
For synchronising your calendars and contacts across different devices and applications you can use the CalDAV and CardDAV protocols. These protocols enable an open, standardised connection to your calendar and address book system – regardless of the software or operating system you use.
What are CalDAV and CardDAV?
CalDAV and CardDAV allow secure and platform-independent synchronisation of your calendars and contacts.
While CalDAV is specifically designed for managing calendar data such as appointments, events, and tasks, CardDAV is used for exchanging and maintaining contacts in address books.
Both protocols are based on WebDAV, an extension of the HTTP protocol, and transfer all data securely via HTTPS. This ensures that your information remains protected during access and synchronisation. Thanks to their open standardisation, CalDAV and CardDAV are compatible with a wide range of modern applications and operating systems – from mobile devices to professional desktop applications.
Benefits of using CalDAV and CardDAV
- Access calendars and contacts from any device
- Support for managing shared calendars and address books
- Compatibility with various applications and operating systems
Setup guides for different applications
Below you will find step-by-step instructions for setting up CalDAV and CardDAV in the most common applications:
Android
CalDAV & CardDAV on Android (DAVx⁵)
Set up synchronisation using the DAVx⁵ app to securely manage calendars and contacts on Android devices. This guide includes recommended settings and troubleshooting tips.
iOS and macOS
CalDAV & CardDAV on iOS / macOS
Learn how to connect your iPhone, iPad, or Mac with your calendar and address book using the built-in system settings.
Thunderbird
CalDAV & CardDAV in Thunderbird
Setup via the Thunderbird calendar and address book functions, including the use of shared calendars and address books.
Outlook
Instructions for integrating Microsoft Outlook using a CalDAV/CardDAV plug-in (e.g. CalDAV Synchronizer) to synchronise appointments and contacts.
KOrganizer
Synchronising calendar and address book with KOrganizer
Evolution
CalDAV & CardDAV in Evolution (Linux)
How to configure CalDAV and CardDAV in the Evolution email client on Linux – including SSL verification and synchronisation options.
Additional information
If you use multiple calendars or address books in your mailbox account, make sure to select the correct resource URL for each one. Every calendar or address book has its own address, for example https://dav.mailbox.org/caldav/<calendarname>/. In most applications, this URL is detected automatically, but it can also be entered manually if necessary. An incorrect URL may result in synchronisation issues or missing data.
If synchronisation does not work as expected, please first check the SSL connection and the server address. The connection must always be established securely via https://dav.mailbox.org to ensure your data remains protected. Make sure no certificate warnings appear and that you have a stable internet connection. In some cases, it may help to open the server address in a browser to verify accessibility.
Please note that setup steps may vary slightly depending on the application, operating system, or version used. The procedures described in the Knowledge Base are intended as a general guide. If the interface in your app differs, follow the equivalent menu paths. Many applications automatically detect the correct settings once you enter your mailbox login credentials.
