Efflux Migrator throwing unhandled exception error

When Efflux throws the following error on migrating a user mailbox or batch of user mailboxes from source Exchange server to Target Exchange Server:

To resolve the above unhandled exception error on Efflux Migrator, follow the steps below:

  1.  Make sure you are running the latest .NET framework on your machine where Efflux Migrator is installed
  2.  Make sure to add the correct Accepted Domain for target mailbox
  3.  MRS proxy has to be enabled on both source and target Exchange Server
  4.  Make sure Microsoft Exchange Replication service is running on both source and target Exchange Server.

If you still face the error, restart the Microsoft Exchange Replication service on source and target Exchange Server and your issue will be resolved.