Autocomplete in Outlook returns NDR after cross forest migration

Symptom:

Users migrated to new domain / new forest cannot send e-mails with outlook autocomplete function.
NDR #550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##

Issue affects only internal mail flow.

Solution:

Added the LegacyDN in contact of the user in the new forest as additional e-mail address type x500

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