EVDominoExchangeMigration has been tested with items that had been migrated using Binary Tree Universal and with Quest Notes Migrator for Exchange. If you want to use a different mailbox migration tool, you must ensure that the appropriate Enterprise Vault message attributes are mapped to their corresponding MAPI attributes.
Table: Enterprise Vault message attributes lists the mappings required for message attributes.
Exchange named properties must all have a GUID of D0F41A15-9E91-D111-84E6-0000F877D428 and be of kind MNID_STRING.
Table: Enterprise Vault message attributes