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.

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Integrated threat protection for all of Office 365

Native protection for Office 365

Built-in protection simplifies administration, lowers total cost of ownership, and boosts productivity.

Industry-leading AI and automation

Unparalleled scale and effectiveness with powerful automated workflows improve SecOps efficiency.

Comprehensive approach

A complete solution for collaboration protects organizations from attacks across the kill chain.

A holistic view of threat protection

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

Product overview

See an overview of Defender for Office 365 features and comprehensive instructions.

Data sheet

View the data sheet that explains how Defender for Office 365 keeps your email, data, and business secure.

Customer case studies

View stories about customers who have implemented Defender for Office 365.

Get started and do more with Defender for Office 365

Start a trial

Try Microsoft 365 E5 Security to experience Defender for Office 365 and other security products.

Get it with Microsoft 365

Get started with Defender for Office 365 included with a Microsoft 365 E5 purchase.

Already have it?

Leverage Defender for Office 365 to protect your Office 365 environment against advanced threats.

Defender for Office 365 helps organizations secure their enterprise by offering a comprehensive slate of prevention, detection, investigation and hunting, response and remediation, awareness and training, and secure posture features.