We are trying to move our last Arbitration mailbox from the Exchange 2013 (CU 23) DB to 2019 (CU 4) DB. I have tried through Exchange Powershell and EAC to move this mailbox but I get the same error: "Transient error BigFunnelTransientException has
occurred. The system will retry." Loading Messages does not go beyond 20%. I restarted both Exchange servers. Of course this is the only mailbox holding me up from decommisioning my Exchange 2013 server. Does anyone have any insight as to why its getting
stuck?
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