Calendars and address books contain very sensible personal data. So it's not advisable to share them with companies like Google or Apple. But with more than one client system in use, it is necessary to run an own calendar server to synchronize that data between the clients.
The first part of this article describes the installation and configuration of a calendar and contacts server. After that follows the presentation of calendar and address book programs for the Linux console and the Android operating system.
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