We had a few migrations of Microsoft 365 Exchange again this weekend and with some of the imports we got error messages that sometimes many mails (about 8 percent of the total volume) could not be imported.
Now it is of course extremely difficult to find out which mails, contacts, appointments etc. could not be imported and, above all, why it did not work.
I am missing a kind of report in the form of a CSV with details of the failed mails etc. and the reason. What is actually feasible for me in this example?
Thanks and best regards