An expert discovered that over 250 million Microsoft customer support records might have been exposed along with some personally identifiable information. Microsoft confirmed that Customer Service and Support (CSS) records were exposed online due to a misconfigured server containing logs of conversations between the support team and its customers. The availability of detailed logs in the hand of crooks could expose Microsoft customers to the risk of Tech support scams. Microsoft secured the servers and data on December 31, 2019, and Microsoft continued the investigation and remediation process.”]
Source: https://securityaffairs.co/wordpress/96726/data-breach/microsoft-data-leak.html