European Banking Authority (EBA) took down all email systems after their Microsoft Exchange Servers were hacked. EBA is part of the European System of Financial Supervision and it oversees the integrity orderly functioning of the EU banking sector. Initial advisory said that the attackers might have gained access to personal information stored on the email servers. An update issued today added that forensic experts had found no signs of data exfiltration. Microsoft says several other threat actors exploit the recently patched Exchange flaws in similar campaigns.
Source: https://www.bleepingcomputer.com/news/security/european-banking-authority-discloses-exchange-server-hack/