A lot of the replies I see to this are people talking about their personal chat histories. For various reasons the trend these days is to not consider those val

A lot of the replies I see to this are people talking about their personal chat histories. For various reasons the trend these days is to not consider those valuable* Where chat histories are valuable and where you see a "store and index it all" approach is enterprise chat. Slack, Google Hangouts Chat, etc, store and archive all the data because that is the collective wisdom of past and present employees and it is valuable to search through. Depending on the industry (i.e. Finance requires this via FINRA) it may even be mandatory to record all communications. * unless you are moving to a new device, but even then it is rare to search that far back in history.