I am migrating multiple domains (SourceA and SourceB) into a new 2016 AD Domain (TargetA).
I want to migrate all the users, groups and workstations into the new TargetA Domain leaving Exchange mailboxes on the SourceA Domain.
I want to use only one migration account, that is, a service account on TargetA Domain, say TargetA\svc-mm
I have added the account TargetA\svc-mm to the Built-in Administrators on SourceA Domain, SourceB Domain and TargetA Domain.
Does the migration account TargetA\svc-mm needs more rights than those?
I know in the installation instructions have it more complicated than that, with migration account on the source domains as well, but I am not sure they are needed, are they?