This will not be possbile, the product will not have the ability to rationalize the forest since we have no AD access and ExPro requires it to perform forest rationalization.
Do you have access to the source Exchange Server via PowerShell or EWS depends on the version of Exchange? If we don't have access to those as well, we won't be able to copy permission or mail enable the public folder which making the migration even harder as these functionality always needed for any public folder migration.
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