To be able to browse by category and summary instead of just persons and dates, to then review the original documents: https://www.hexane.cc/

Quote from the website:

"This is an index. The original messages — full headers, bodies, attachments, byte for byte — are in the torrent, inside standard .mbox files. Download the archive, open those files in any mail client, and you have exactly what the party's servers held.

Nothing on this site replaces that, and nothing on this site should be cited as a primary source."