Microsoft still doesn’t know — or want to share — how China-backed hackers stole a key that allowed them to stealthily break into dozens of email inboxes, including those belonging to several federal ...

A series of unfortunate and cascading mistakes allowed a China-backed hacking group to steal one of the keys to Microsoft’s email kingdom that granted near unfettered access to U.S. government inboxes ...

Microsoft said in June that a China-backed hacking group had stolen a cryptographic key from the company's systems. This key allowed the attackers to access cloud-based Outlook email systems for 25 ...