Exchange Migrator 1.x
Exchange Migrator 2.x
Exchange Migrator is not using the Protar.mdb mapping file that was imported from DMA.
This issue will manifest when importing a Protar.mdb file that was exported from Domain Migration Administrator (DMA) versions 6.2 and earlier.
To resolve this issue upgrade to DMA version 6.3 or later, then import the new Protar.mdb file into Exchange Migrator.
To learn how to import the Protar.mdb into Exchange Migrator, please see the following Knowledge Base article:
NETIQKB1886: How do I import a mapping file (Protar.mdb) from a DMA migration into Exchange Migrator