Note If you are migrating user mail boxes and choose to retain the default mail file ACL during migration, the administrator ID remains in the ACL as Manager if the mail box conversion fail.
You may need manager access to the mail file to perform additional tasks. For instance, you may need to convert additional messages for users after you migrate them to Notes and create their Notes mail files. However, under the default mail file ACLs, you do not have the level of access needed because your ID has been removed from the mail file ACLs.
If you anticipate needing to perform such a secondary migration, when you first select users to migrate, select the migration option "Add administrator to mail file access control list" from the list on the People and Groups Migration dialog box. This option changes the default mail file ACL so that the administrator retains Manager access to the mail file. The owner of the mail file also remains in the ACL with the default Manager access.
Note This option adds the administrator ID to the ACL of every mail file you create during the migration process, regardless of whether any messages are migrated.