The MBox file was changed by another program. A copy of the new file was made and pending changes are appended to that copy. To prevent this from happening use locking and make sure that all programs accessing the mbox use the same locking method.
Outro programa alterou o ficheiro MBox. Fíxose unha copia do ficheiro novo e as modificacións pendentes engadíronse a esa copia. Para evitar que isto aconteza, empregue o bloqueo e verifique que os programas que accedan ao mbxo empreguen o mesmo método de bloqueo.