1. A server system, for searching conversations, comprising: one or more processors; and memory storing one or more programs to be executed by the one or more processors; the one or more programs comprising instructions for: receiving a search query from a client; and responsive to the search query: identifying a plurality of conversations relevant to the search query, the plurality of conversations including at least two conversations each having two or more messages sharing a common set of characteristics that meets predefined criteria and a respective conversation identifier; and returning to the client for display, as a search result to the search query, (i) a list of the identified conversations, each conversation in the list being represented as a single item, at least one conversation in the list of identified conversations comprising two or more electronic messages; and (ii) a representation of a count of electronic messages included in the at least one conversation.