Microsoft's AI research team was also found to have mistakenly leaked 38TB worth of the company's private data. The leaked data included backups to Microsoft employees' computers, which contained passwords to Microsoft services, secret keys, and over 30,000 internal Teams messages from over 350 company employees.

source https://www.windowscentral.com/microsoft/microsofts-ai-research-team-mistakenly-leaked-38tb-of-the-companys-private-data