This mapping ensures that, when the group's members are migrated from the source domain into the target domain, group memberships will reflect the mapping. You can also merge multiple groups into one group. By selecting the Test the migration settings and migrate later option, you can run a wizard without actually making any changes in your network. Review the log files and reports generated by the wizards to identify and troubleshoot any potential problems before performing the actual migration. You can undo the most recently performed user, group, or computer migration.
Users maintain access to resources.
During user and group migration, ADMT lets users retain their premigration access to resources such as files, shares, and applications through its sIDHistory feature or by updating those resources to refer to the migrated user. Users retain access to Exchange resources. If you need to update security permissions on Exchange mailboxes to reflect the migration, ADMT can also handle that. Service accounts migrate too. ADMT also migrates service accounts.