10. The method of claim 9 , wherein the set of information pertaining to the received electronic message comprises: (1) an indication of a particular electronic message type for the received electronic message; (2) an indication that the received electronic message was sent by a particular participant in the electronic message conversation; and (3) a particular sequence indicator indicating an order in which the received electronic message was sent by the particular participant relative to other electronic messages of the particular electronic message type sent by the particular participant in the electronic message conversation.
10. The method of claim 9 , wherein the set of information pertaining to the received electronic message comprises: (1) an indication of a particular electronic message type for the received electronic message; (2) an indication that the received electronic message was sent by a particular participant in the electronic message conversation; and (3) a particular sequence indicator indicating an order in which the received electronic message was sent by the particular participant relative to other electronic messages of the particular electronic message type sent by the particular participant in the electronic message conversation. 13. The method of claim 10 , wherein determining whether the electronic message conversation data structure is missing information pertaining to the prior electronic message comprises: determining whether the electronic message conversation data structure is missing information pertaining to an electronic message of the particular electronic message type that was sent by the particular participant having a sequence indicator that immediately precedes the particular sequence indicator of the received electronic message.