China-based hackers have accessed email accounts of several organizations including some US and Western European government agencies. The breach was reportedly detected only weeks after the activity began.
Chinese state-linked hackers have secretly accessed email accounts at about 25 organizations, including government agencies, Microsoft said on Wednesday.
Microsoft did not say which organizations or governments had been affected, but added that the hacking group primarily targets entities in Western Europe.
"Microsoft has contacted all targeted or compromised organizations directly via their tenant admins and provided them with important information to help them investigate and respond," the statement on the company's website said.