The default limit for the number of bad items is 500. Users can change this default limit before starting or scheduling the migration job. The mailbox migration will stop when the software detects more bad items than the default or customized limit.
While creating a mailbox or public folder migration job, you have enabled the option to cancel the migration when the software detects a certain number of bad items.
To avoid this issue, create the mailbox or public folder migration job without checking the “bad items” options. However, by doing this you may not find about how many bad items are on the Source Exchange Server.
Specify a high limit for the number of bad items.