Alarmed at the massive attack by nation-state threat actors including from China on its business email servers, Microsoft has announced the expansion of its enterprise-grade identity and access management protection service 'AccountGuard' to all high-risk members in 31 countries at no additional cost.

Microsoft AccountGuard provides notification about cyberthreats, including attacks by known nation-state actors, in a unified way across both email systems run by organizations and the personal accounts of leaders and staff who opt in.