A method of representing a conversation of related messages in a message collection user interface displayed on a display of a wireless communication device , the message collection user interface displaying a list of messages from one or more communications applications, the method comprising the steps of: displaying a message collection user interface having a plurality of dynamic session placeholders , each dynamic session placeholder representing a respective conversation of related messages constituting a messaging communication session, each dynamic session placeholder displaying a time stamp indication in accordance with a time stamp of a most recent message in the conversation and an identification of another party to the conversation, each dynamic session placeholder presented as a single entry in a list of messages in the message collection user interface and chronologically ordered within the list of messages in the message collection user interface according to a corresponding time stamp of action of the most recent message in the conversation of related messages represented by the respective dynamic session placeholder ; in response to transmission by the wireless communication device of a new message in the conversation of related messages defined by any one of the dynamic session placeholders , updating the time stamp indication for the new message in the conversation with the time stamp of transmission, and automatically, without user input, reordering the plurality of dynamic session placeholders within the list of messages based on the time stamp of transmission of the new message in the conversation of related messages; and displaying the reordered list of messages in the message collection user interface. displaying a message collection user interface having a plurality of dynamic session placeholders , each dynamic session placeholder representing a respective conversation of related messages constituting a messaging communication session, each dynamic session placeholder displaying a time stamp indication in accordance with a time stamp of a most recent message in the conversation and an identification of another party to the conversation, each dynamic session placeholder presented as a single entry in a list of messages in the message collection user interface and chronologically ordered within the list of messages in the message collection user interface according to a corresponding time stamp of action of the most recent message in the conversation of related messages represented by the respective dynamic session placeholder ; in response to transmission by the wireless communication device of a new message in the conversation of related messages defined by any one of the dynamic session placeholders , updating the time stamp indication for the new message in the conversation with the time stamp of transmission, and automatically, without user input, reordering the plurality of dynamic session placeholders within the list of messages based on the time stamp of transmission of the new message in the conversation of related messages; and displaying the reordered list of messages in the message collection user interface. <EOS>