I have Thunderbird 16, Exchange Calendar 3.0.0. In “Exchange (EWS) Properties” of a calendar I discovered that the tab “Meeting requests” does not show any options, just this message:
“You cannot set meeting request because you did not select the main calendar for the mailbox”
I was looking into the resources for Lightning and Exchange calendar but anywhere I could not find what is the “main calendar for a mailbox” and how to set it. Could you please explain?
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