Hi Jan,
Currently, there isn't a global calendar view within Trello, or a way to use a single iCal feed across multiple boards.
For now, you could use the Planyway Power-Up to view due dates from other boards on an individual board's calendar, or you can use the third-party calendar connector from Cronofy to connect multiple Trello boards to your preferred calendar app without having to deal with iCal feeds.
While we're not able to endorse or provide support for third-party services (since we don't work with them directly), we've heard good things about that one. You can find more information about it here: https://trello.cronofy.com/
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