11. The method of claim 10 further comprising displaying the aggregate conversation header where at least one message of the list of messages is not in view.
10. The method of claim 6 further comprising presenting the conversation in a list pane comprising the hierarchical display of aggregated electronic mail messages, the hierarchical display identifying parent-child relationships between related electronic mail messages and visually differentiating electronic mail messages outside of the identified scope from electronic mail messages within the identified scope.