Microsoft Defender for Office 365

Protect all of Office 365 against advanced threats like business email compromise and credential phishing. Automatically investigate and remediate attacks.

Microsoft Defender for Office 365 has been named a Leader in The Forrester Wave™: Email Security, Q2 2021.

Integrated threat protection for all of Office 365

Native protection for Office 365

Boost productivity, simplify administration, and lower total cost of ownership with built-in protection.

Industry-leading AI and automation

Improve SecOps efficiency through unparalleled scale and effectiveness using automated workflows.

Comprehensive approach

Help protect your organization from attacks across the kill chain with a complete solution for collaboration.

A holistic view of threat protection

Microsoft Defender for Office 365 supports organizations throughout the lifecycle of an attack.

Ithaca College logo

Ithaca College foils cyberattacks with the comprehensive threat protection built into Microsoft 365

“The incident detection and response capabilities we get with Defender for Office 365 give us far more coverage than we’ve had before. This is a really big deal for us.”

Jason Youngers, Director and Information Security Officer

More about Defender for Office 365

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Data sheet

Learn how Defender for Office 365 keeps your email, data, and business secure.

Customer case studies

See how customers have implemented Defender for Office 365.

Get started and do more with Defender for Office 365

Try it

Experience Defender for Office 365 and other security products with a Microsoft 365 E5 Security trial.

Get it with Microsoft 365

Start using Defender for Office 365, included with a Microsoft 365 E5 purchase.

Already have it?

See how Defender for Office 365 can help protect your Office 365 environment against advanced threats.

Microsoft Defender for Office 365 helps organizations secure their enterprise with a comprehensive slate of capabilities across prevention, detection, investigation and hunting, response and remediation, awareness and training, and secure posture.