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.
18. The method of claim 14 , wherein when the user is a sender of a respective message of the plurality of messages, the providing presentation information for displaying includes providing presentation information for displaying a unique character string or icon is displayed to identify that the user is the sender.