User failing to migrate with “Server returned an invalid SOAP Fault – unexpected end of file”

The customer here was trying to migrate a mailbox from an Exchange 2010 server to Exchange Online. Exchange 2013 was being used as the hybrid server and MRS proxy. Server/domain/item names have been changed to protect the innocent. 🙂 The error being encountered was: CommunicationErrorTransientException: The call to ‘https://mail3.state.nn.us/EWS/mrsproxy.svc XYZ-SERVER.domain.w2k.state.nn.us (15.0.1104.4 caps:1F7FFFFFCB07FFFF)’ failed. Error details:…

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