DAVx⁵ has been successfully tested with is a German email provider and focused on privacy. address books, calendars and tasks can be synchronized with DAVx⁵.

It is based on Open-Xchange.

CalDAV/CardDAV setup

Choose "Login with email address" and enter your email address and password.

If you use your own domain with, use the "Login with Base URL" option:
Base URL:
Username: your email address
Password: your password

Contact group method: There is no server-side CardDAV contact group support. Choose "per-contact categories" as contact group method to minimize problems.

Known limitations

There are some known limitations:

  • Contacts: Not all email addresses and phone numbers are always stored and/or shown in the Web interface. For more information, see AppSuite:VCardMapping.
  • Calendar – Birthdays calendar: Birthdays without a year won't show correctly in the birthday calendar (because they internally have set 1604 as year and years before 1902 can't b processed correctly by Androids calendar storage).
  • Calendars: Events which are more than one year in the future seem to be not sent over CalDAV, so they can't be synchronized.

WebDAV setup

You can access files from Cloud/Drive using the DAVx⁵ WebDAV mounts feature.


User name: your email address or username
Password: your password or your app-password