Currenty, Intella dedupes based on message hash. We typically work with PST's and OST's received from various custodians in a typical client organization. We run searches and export the Intella unique results to PST. When we run those Intella PST's through another application with different dedupe options, we typically find a duplicate rate of 25-50+ percent. Most of our clients are attorneys and they are interested in reviewing a particular message only once. We have found with other apps the most effective way to get to actual unique content is to compare the "to", "from", "cc", "bcc", "subject", "date/time (strip milliseconds)".
Support is looking to add this capability in 1.8.4 and I wanted to ask the community if there are any other deduping options you would like to see?