Microsoft investigating if internal leaks are responsible for large scale suspected Chinese hack The White House on Friday said it is still trying to determine the full scope and scale of the massive global hack of Microsoft email server software, adding that hackers likely still have access to systems. Akarsh Verma | March 14, 2021 | Updated 17:27 IST Highlights American National Security Adviser said the U.S. is still working to determine the full scope and scale of the Microsoft Exchange hack. Cybersecurity analysts believe Chinese cyber spies are behind the recent attacks on US corporations. Microsoft is investigating whether the hack might be linked to information that was leaked by the company or its partners.