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    Your Mail Business contacts can be used as a source for macOS contacts. This article explains how they can be synchronized.

    Prerequisites

    • Mail Business Mailbox
    • macOS 10.7 (Lion) or a more recent version.
    • In the macOS Dock, click System Preferences.
    • Select Internet Accounts > Add Another Account... > CardDAV Account.
      On older systems, this menu item is called Mail, Contacts & Calendars.
    • In the Account Type  field, select Manual.
    • Enter the following data:
      - Username:  Your complete email address
      - Password: Your email password
      - Address: dav.mailbusiness.ionos.com/
    • Click on Log in.
    Note

    Please note that all contacts are always synchronized. It is not possible to restrict the synchronization to certain address books from Mail Business.