After Russian hackers exploited a flaw in a widely used Microsoft product during one of the largest cyberattacks in U.S. history, the software giant downplayed its culpability.
However, a recent ProPublica investigation revealed that a whistleblower within Microsoft’s ranks had repeatedly attempted to convince the company to address the weakness years before the hack — and that the company rebuffed his concerns at every step.
Here are the key things you need to know about that whistleblower’s efforts and Microsoft’s inaction.
Read the full story on Propublica