Netmail Archive 5.x
The master node processed migration jobs with out issue. New worker nodes consistently produced the error "Description: error in converttoexchange(), access is denied" in any migration job. The scenario was that the migration job would finish the filtering stage and then stop progressing.
The problem was that the all migration jobs had a SYSTEM.MAP reference to a remote file system while the worker node services were running as LOCAL SYSTEM ACCOUNT. Because the worker node(s) were running as LOCAL SYSTEM ACCOUNTS they could not read the referenced SYSTEM.MAP on the the remote file system.
Either the workers need a NETDRIVES.TXT file that provides authentication information for the remote file system, or the Netmail Archive services needed to run as user that had file system rights to read the SYSTEM.MAP file.