Before you migrate data, you should determine whether to use one-step or two-step migration.
One-step All the data is first extracted for all selected mailboxes and then immediately imported. The hard disk of the temporary directory needs to have enough available space to store the migrated data.
Two-step Extracts the selected information to the migration files, and stops. You can then edit the migration files as needed and import them. This is the only way to change the default directory name.