China accused the US of exploiting a flaw in Microsoft Corp.’s email servers to steal military data and launch cyberattacks on its defense sector.The Cyber Security Association of China said in a statement Friday that US actors had been linked to two major cyberattacks on Chinese military companies, without naming them. They exploited flaws in Microsoft Exchange to control the servers of a key company in the defense sector for nearly a year, it added. The association is a little-known entity bac...