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Microsoft Security

Microsoft Defender for Office 365

Help secure your email and Microsoft Teams with advanced protection against phishing, business email compromise, ransomware, and other threats.

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SE Labs names Defender for Office 365 “Best Email Security Service”

Defender for Office 365 was recognized as “Best Email Security Service” of 2023 by SE Labs.

Integrated threat protection for your email and collaboration tools

Strengthen email security without compromise

Help protect your organization against advanced attacks, such as BEC, with native email security that automatically stops attack progression and boosts SecOps productivity.

Get comprehensive security for collaboration tools

Defend against emerging phishing attacks that target collaboration tools by protecting your Microsoft Teams environment with a unified detection and response experience.

Enhance security with industry-leading AI and automation

Get unparalleled accuracy with AI-enabled detection capabilities. Gain a better understanding of your organization's threat landscape and vulnerabilities with advanced analytics and automated workflows.

Defend against advanced attacks with XDR

Combat sophisticated attacks using email and collaboration signals as part of your detection and response in Microsoft 365 Defender. Use incident-based detections to hunt across the entire kill chain.

Be more efficient

Save up to 60 percent by using Microsoft Security rather than multiple point solutions.1


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Help prevent a wide variety of volume-based and targeted attacks, including business email compromise, credential phishing, ransomware, and advanced malware with a robust filtering stack.

Screenshot of a report in the protection portal showing a phishing campaign


Automatically detect malicious and suspicious content, such as links and files across email and Microsoft Teams, with industry-leading AI capabilities.

Screenshot of a report in the protection portal showing malware threats detected by the service, organized chronologically.

Investigation and hunting

Detect and respond to attacks with a unified investigation experience, full kill-chain visibility, and advanced hunting capabilities to identify and prioritize threats.

Close-up photograph of a laptop displaying an investigation graph with information about weaponized URLs in email.

Response and remediation

Respond and remediate incidents with built-in automation that reverses malicious activities and custom setups that enable security teams to scale and be more efficient.

Screenshot of a report showing results from a phishing simulation campaign run in an organization.

Awareness and training

Run attack simulations and train your users with data-driven insights on the most common attacks and knowledge gaps specific to your organization.

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Secure posture

Use recommended templates and configuration insights to help your organization get and stay secure.

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Integrated threat protection with SIEM and XDR

Empower your defenders to effectively secure your digital estate by combining extended detection and response (XDR) and security information and event management (SIEM).

Microsoft 365 Defender dashboard highlighting active incidents, active threats, and more.

Microsoft 365 Defender

Get unified security and visibility across endpoints, identities, emails, and cloud apps with an industry-leading XDR solution.

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A holistic view of threat protection

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

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Industry recognition

Microsoft Security is a recognized industry leader.


The Forrester Wave™: Enterprise Email Security

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

SE Labs

SE Labs: Best Email Security Service

Defender for Office 365 was recognized by SE Labs as the “Best Email Security Service” in 2023.

See how customers implement Defender for Office 365

St. Luke’s University Health Network

See why St Luke’s University Health Network moved from Proofpoint to Defender for Office 365.


Read how bp is bolstering its resilience against phishing campaigns with Microsoft Defender for Office 365.

Compare flexible purchase options

Explore the comprehensive security capabilities offered by Microsoft Defender for Office 365 Plan 1 and Microsoft Defender for Office 365 Plan 2. These capabilities are also included in Microsoft 365 E5 Security.

Microsoft Defender for Office 365 (Plan 1)

Originally starting from NZ$3.20 now starting from NZ$3.20

NZ$3.20 NZ$3.20


Defender for Office 365 Plan 1 offers protection against advanced attacks across email and collaboration tools in Office 365.

  • Protection against advanced attacks, such as phishing, malware, spam, and business email compromise

  • Protection beyond email (Microsoft Teams, SharePoint, OneDrive, and Office apps)

  • Internal email protection

  • Detailed reporting

Microsoft Defender for Office 365 (Plan 2)

Originally starting from NZ$8.10 now starting from NZ$8.10

NZ$8.10 NZ$8.10


Defender for Office 365 Plan 2 offers everything in Plan 1 plus advanced threat hunting, automation, attack simulation training, and cross-domain XDR capabilities.

  • Protection against advanced attacks, such as phishing, malware, spam, and business email compromise

  • Protection beyond email (Microsoft Teams, SharePoint, OneDrive, and Office apps)

  • Internal email protection

  • Detailed reporting

  • Advanced threat hunting

  • Automated investigation and response

  • Attack simulation training

  • Microsoft 365 Defender (XDR) capabilities, such as cross-domain hunting and incident correlation

Note regarding users in Australia
Due to Australian Taxation laws if you wish to assign licenses to users located in Australia you may not purchase your subscription through this website. Please contact a Microsoft certified partner to discuss your purchasing options, or contact the Microsoft 365 sales team for further assistance.

Related products

Use best-in-class Microsoft security products to prevent and detect attacks across your Microsoft 365 workloads.

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Attack Simulation Training

Automatically deploy a security awareness training program and measure behavioral changes.

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Microsoft Defender for Endpoint

Explore endpoint security for businesses with more than 300 users.

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Microsoft Defender for Identity

Manage and secure hybrid identities and simplify employee, partner, and customer access.

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Microsoft Defender for Cloud Apps

Get visibility, control data, and detect threats across cloud services and apps.

More about Defender for Office 365


Stay up to date

Get product news, configuration guidance, tips, and other information.


Help protect your business

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


Explore documentation

Review technical guidance for Defender for Office 365.


Become an expert

Train to become an expert in Defender for Office 365, whether you’re a beginner or have experience.

Protect everything

Make your future more secure. Explore your security options today.

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