37. The memory device of claim 36 , 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 precedes the particular sequence indicator of the received electronic message.
37. The memory device of claim 36 , 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 precedes the particular sequence indicator of the received electronic message. 38. The memory device of claim 37 , wherein the operations further comprise: receiving a response to the request electronic message, the response including the prior electronic message that was requested in the request electronic message; obtaining a set of information pertaining to the prior electronic message; accessing the electronic message conversation data structure; and updating the electronic message conversation data structure to include the set of information pertaining to the prior electronic message.