6. The method of claim 4 further comprising selectively expanding the aggregate conversation header to display at least a portion of the list of messages.
6. The method of claim 4 further comprising selectively expanding the aggregate conversation header to display at least a portion of the list of messages. 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.