20. The method of claim 14 , wherein each row in the set of rows includes a conversation topic and a date/time value for the conversation represented by the row.
14. A computer-implemented method of processing messages, performed on a server system having one or more processors and memory storing one or more programs for execution by the one or more processors to perform the method, comprising: receiving a plurality of messages directed to a particular user, each message having a unique message identifier; associating each of the plurality of messages with a respective conversation; associating with each conversation a sender list, the sender list identifying a set of senders of messages included in the conversation; and providing presentation information for displaying a list of conversations and their associated sender lists comprising a set of rows, each conversation in the list of conversations being represented as a single row in the set of rows, the single row including conversation identifying information for the conversation and the sender list associated with the conversation; and wherein the sender list of at least one respective conversation in the list of conversations identifies two or more distinct senders of messages in the respective conversation.