The migration failed checking Source credentials. The handshake failed due to an unexpected packet format.
This error indicates that MigrationWiz is attempting to log in to an IMAP server using SSL while the server is only supporting non-SSL connection. Usually, this means that port 143 was specified, and the Use a secure connection (SSL) option was enabled.
- Update the project to connect on the IMAP server on its SSL enable port (usually 993).
- Uncheck Use a secure connection (SSL).