The domain pair used by directory synchronization and migration was created before Exchange was installed into the target forest/domain.
This can be verified by going into the Properties for the domain pair, Object Matching Tab - Attributes to skip button. If there is no Exchange in the forest, then by default the adminDescription and adminDisplayName attributes are used to store auxiliary information for all object classes. In the scenario where Migration Manager can see Exchange organization, Custom Attributes 14 and 15 will be used.
To resolve this you must remove the current domain pair and then recreate the domain pair once Exchange has been installed into the target.
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