A unified messaging system, method and user interface is provided for a handheld mobile communication device. The method may include the following steps: (a) providing a unified event listing display comprising: a plurality of summary descriptors, each summary descriptor having one or more information elements to identify the event associated with the summary descriptor; (b) selecting one of the plurality of summary descriptors; (c) displaying a voice mail interface associated with the selected summary descriptor, wherein a plurality of voice mail actions are displayed on the interface; (d) selecting one of the plurality of voice mail actions; (e) communicating a voice mail command associated with the selected voice mail action to a unified messaging server via a wireless data communication network; (f) receiving the voice mail command at the unified messaging server; (g) executing an action associated with the received voice mail command at the unified messaging server; (h) establishing a circuit-switched communication connection to the mobile device from a PBX system associated with the unified messaging server; and (i) performing an action corresponding to the received voice mail command through the established circuit-switched communication connection.