In July 2015, the Italian security firm Hacking Team suffered a major data breach that resulted in over 400GB of their data being posted online via a torrent. The data searchable on "Have I Been Pwned?" is from 189GB worth of PST mail folders in the dump. The contents of the PST files is searchable on Wikileaks.
Accounts breached: 32310
Breached on: July 06, 2015
Exposed data: Email addresses and Email messages
Added on: July 12, 2015