Native Move migrations are failing with an "Invalid situation" error. The log file contains entries similar to the following example:
2016-01-13 13:10:33.5933 PxB10 TxF A4 C2 M1 Trace PowerShell serverName - 'SERVER1', target mailbox database OwningServerName - 'SERVER2'.
2016-01-13 13:10:33.5933 PxB10 TxF A4 C2 M1 Error Invalid situation, the version of source or target side is not supported.
2016-01-13 13:10:33.5933 PxB10 TxF A4 C2 M1 Info Native Move Job has been finished(State - 'Failed').