Microsoft news: NCSC has contacted 2,300 businesses urging them to update their Exchange servers (Image: GETTY) READ MORE Microsoft shared on March 2 flaws in their Exchange email servers were exploited by hackers. It was initially used by a hacking group to gain remote access to email servers, from which it could steal sensitive data. After Microsoft called attention to the fault, multiple hacking groups rushed to find unpatched email servers to attack. The company also blamed the initial attack on Hafnium, a group the company "assessed to be state sponsored and operating out of China”. The "state-sponsored" actor was identified by the Microsoft Threat Intelligence Centre based on observed "tactics and procedures," according to the company.