9. A conversation-based message system, comprising: one or more conversation servers, the one or more conversation servers comprising: memory; one or more processors; and one or more programs stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions to: receive a search query; in response to receiving the search query: obtain, from a message repository, conversations relevant to the search query; create a list of conversations representing at least a subset of the obtained conversations, wherein each conversation in the list of conversations is represented as a single item, and at least one of the conversations in the list of conversations comprises two or more electronic messages from distinct senders; identify, for each conversation in the list of conversations, a portion of conversation content relevant to the search query; and produce, for concurrent display at a client, a search result including at least the list of conversations, and the identified portion of conversation content for each conversation in the list of conversations.
9. A conversation-based message system, comprising: one or more conversation servers, the one or more conversation servers comprising: memory; one or more processors; and one or more programs stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions to: receive a search query; in response to receiving the search query: obtain, from a message repository, conversations relevant to the search query; create a list of conversations representing at least a subset of the obtained conversations, wherein each conversation in the list of conversations is represented as a single item, and at least one of the conversations in the list of conversations comprises two or more electronic messages from distinct senders; identify, for each conversation in the list of conversations, a portion of conversation content relevant to the search query; and produce, for concurrent display at a client, a search result including at least the list of conversations, and the identified portion of conversation content for each conversation in the list of conversations. 15. The system of claim 9 , wherein the one or more programs further comprise instructions to obtain, for one or more conversations in the list of conversations, one or more labels associated with the respective conversation; and wherein producing the search result for concurrent display at the client includes producing the obtained labels for concurrent display with the list of conversations and the identified portion of conversation content for each conversation in the list of conversations.