In complex environments crossing domains, organizations and forests, consideration must be given to the permissions / access requirements of the
Archive Shuttle export and import modules that are required for the migration.
The basic requirement is that the Active Directory account that the export module runs under needs to be able to read/write to the storage location. In addition, the required import module also requires read/write access to the storage location.

The export/import storage location is specified as a UNC. Hidden shares are supported