Can't open Mail after Monterey upgrade, index broken, prompted to re-import messages but import fails
After upgrading my 2015 MacBook Air to Monterey, I have almost the same problem as described in
Can't open Mail, Index is broken! - Apple Community
I would like to try the same solution as offered there but am not sure which Library files I should try to delete in Monterey. Can you help?
MacBook Air 11″, macOS 12.2