DutchNews.nl reports:
Dutch detectives have gained access to 3.6 million encrypted emails sent by criminal gangs which will be used in dozens of prosecutions, the public prosecution department said on Thursday. The information in the mails will provide evidence for criminal cases, including murder, armed robbery, drugs, money laundering and other forms of organised crime, the department said in a statement.
The messages were found on servers in Canada belonging to a Dutch company called Ennetcom. Last year, the public prosecution department won the right to have the Ennetcom servers copied and the seven terabytes of information sent to the Netherlands for investigation.
Read more at DutchNews.nl.
Update: Read about how they were able to decrypt the messages on HackRead.