Shock in the morning

This looks like a lot of work today:

Screenshot 2023-03-13 at 09.59.35

Any idea why this is happening from time to time?

Looks like integer overflow to me, perhaps unread folder counts are waiting for sync while the mail server already reported the real number and that gives a negative number that the mail client displays as an unsigned integer.

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True - an over / underflow is a good explanation. After ea re-start of Mail, I am back to 139 read messages.