Microsoft announced that security administrators will soon be able to block external users from sending messages, calls, or meeting invitations to members of their organization via Teams.

Hackers thought to be aligned with China and Russia are suspected to be behind a wave of account takeover attacks targeting Microsoft 365 users.

Microsoft is working to mitigate an ongoing incident that has been blocking access to some Defender XDR portal capabilities, including threat hunting alerts. According to an admin center service alert ...

Cybersecurity researchers have shed light on a cross-tenant blind spot that allows attackers to bypass Microsoft Defender for Office 365 protections via the guest access feature in Teams. "When users ...