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Question: iCal appointments disappear after acceptance

Quite regularly, my appointments disappear from my calendar when an invitee accepts. This is very annoying. It happens (mostly or always?) with a calendar that is connected to an Exchange account.

I noticed that you have been heaving these issues since 2010 so it must be time to solve them. I see many questions but no real answers.

Thanks in advance for answering.

MacBook Pro with Retina display, iOS 11.2.6

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User profile for user: jurgenkrikke

Question: iCal appointments disappear after acceptance