Messages with prefix ACN are issued by IBM® Tivoli® Storage Manager for Mail, Data Protection for Microsoft Exchange Server. Data Protection for Microsoft Exchange Server interacts with the IBM Tivoli Storage Manager backup-archive clients. When Data Protection for Microsoft Exchange Server runs, you might see messages from backup-archive clients. Backup-archive clients messages have prefix ANS or prefix FMV, depending on which licenses you installed.
For information about ANS messages, see Client messages.
For information about FMV messages, see Tivoli Storage FlashCopy® Manager VSS requester service messages.