Microsoft Corp. issued a progress report on what it described as the largest cybersecurity engineering project in history.Most Read from BloombergTrump Awards $1.26 Billion Contract to Build Biggest Immigrant Detention Center in USWhy the Federal Reserve’s Building Renovation Costs $2.

Multiple hacking groups—including state actors from China—have targeted a vulnerability in older, on-premises versions of the file-sharing tool after a flawed attempt to patch it.