27. The storage device of claim 23 wherein outputting the priority comprises: determining an expected loss of non-review of the subsequent message at a current time; determining an expected cost of alerting the user of the subsequent message at the current time; and, alerting the user of the subsequent message upon determining that the expected loss is greater than the expected cost.
27. The storage device of claim 23 wherein outputting the priority comprises: determining an expected loss of non-review of the subsequent message at a current time; determining an expected cost of alerting the user of the subsequent message at the current time; and, alerting the user of the subsequent message upon determining that the expected loss is greater than the expected cost. 30. The storage device of claim 27 , wherein determining an expected cost comprises determining a probability inference as to a likelihood of the user being present.