To perform public folder synchronization you will need one (or more) standalone agent host server associated with each target Exchange 
Such agent host must meet the following specific requirements:
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 | Note: For complete set of requirements, see Exchange Migration Agents Server in the System Requirements and Access Rights document. | 
Later when configuring migration in Migration Manager for Exchange console, after you register that agent host(s), open its Properties, go to the General | Connection node and select the Communicate with Exchange Server via Outlook MAPI option. Then select the agent host as Default Agent Host in the Properties of an Exchange