When we did a backup for the exchange mailbox we had 991 emails to backup. 980 were successfuland 11 were failed with the reason [MsgId[0x1c000177][The mailbox failed.]:  Args Pushed,  Args expected. Also the job stuck with 84% and running.
And when we killed the job and re ran it again. 982 mails were successfull and 9 was failed with the same reason ans the job is still running. Anyone knows what is that reason [MsgId[0x1c000177][The mailbox failed.]:  Args Pushed,  Args expected? and why the job is still running ? is it because there are some emails were failed to backup ?