Requestor Last Response

In search, is there a way of determining if the last response of a
ticket was from a requestor, and also when their last response was?

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In search, is there a way of determining if the last response of a
ticket was from a requestor, and also when their last response was?

Do you mean to search on it or to see it displayed in the search
results?

If the former, not without code, if the latter, the UpdateStatus
column is similar to your request but not perfect and does rely on
this setting which defaults off:

http://bestpractical.com/docs/rt/latest/RT_Config.html#ShowUnreadMessageNotifications

and this will show the last transaction on the ticket in search history

-kevin