During migration, NSF migrator potentially creates new folders in users' mail files and, as a result, certain actions on these folders are signed by the Domino archiving user. To prevent users seeing execution security alerts when they open the new folders, you must configure affected users' execution control lists to allow Access to current database rights to the Domino archiving user. For more information, see the IBM article at Load Convert -u Changes User Created Folders' Signature to the Mail Server's Name.