Address Book and Calendar
This category provides articles on how to connect calendars, address books, and tasks to your mailbox account. You can synchronize calendars and contacts across platforms – including Android, iOS, Windows, macOS, and Linux. Sharing calendars and address books with other mailbox users or external contacts is also possible.
Several protocols are available for synchronization: ActiveSync (Microsoft Exchange) as well as the open standards CalDAV and CardDAV. Our FAQs explain, among other things, how to assign colors to calendars for better distinction, automatically import public holidays or waste collection dates, and migrate existing data from other providers.
Please note: When using third-party apps, there may be occasional limitations or synchronization issues. We therefore recommend consulting the official documentation of the respective app or
