Email & Collaboration Protection
Defender for Office 365 + Defender for Cloud Apps — Product Overview
Microsoft Defender for Office 365 and Microsoft Defender for Cloud Apps protect two of the most common paths attackers use to reach an organization: email and collaboration tools, and the growing number of SaaS applications employees use every day. Defender for Office 365 is available in two tiers, Plan 1 and Plan 2, while Defender for Cloud Apps provides a single, comprehensive layer of protection across an organization's entire SaaS application landscape. Below is an overview of what each includes and the value it delivers.
Defender for Office 365 Plan 1
Designed for: Organizations that want strong, preventative protection against phishing, malware, and other email-based threats.
What's Included
- Safe Attachments, which opens suspicious files in an isolated environment to test for malicious behavior before they reach a user
- Safe Links, which verifies the safety of a link at the moment it's clicked, not just when the email first arrives
- Anti-phishing protection, including safeguards against domain spoofing and impersonation
- Protection that extends beyond email into Microsoft Teams, SharePoint, and OneDrive
- Real-time detection and reporting
Why It Matters for Your Business
Defender for Office 365 Plan 1 provides strong, preventative protection against the most common way attackers try to breach an organization: a malicious email. Because Safe Links checks a link's safety at the moment someone actually clicks it, rather than only when the email arrives, it protects against attacks where a link is safe at first and turns malicious later. Extending this same protection into Teams, SharePoint, and OneDrive is equally important, since attackers increasingly target collaboration tools and shared files, not just the inbox.
Note
Defender for Office 365 Plan 1 is included with Microsoft 365 Business Premium, and, as of July 1, 2026, is also included with Microsoft 365 E3 and Office 365 E3. Organizations already on one of these plans should confirm what they already have before purchasing Plan 1 as a separate, standalone add-on.
Defender for Office 365 Plan 2
Designed for: Organizations that want to actively investigate email-based threats, train employees to recognize attacks, and respond automatically when something gets through.
What's Included
- Everything in Defender for Office 365 Plan 1, plus:
- Advanced threat hunting, allowing security teams to proactively search for signs of email-based compromise
- Automated investigation and response, reducing the time between a threat being detected and being contained
- Attack simulation training, allowing organizations to safely test and train employees against realistic phishing attempts
- Cross-domain detection and response, correlating email threats with activity across the rest of the organization's environment
Why It Matters for Your Business
Defender for Office 365 Plan 2 recognizes that prevention alone isn't enough — some phishing attempts will always get through, whether due to a sophisticated attack or simple human error. Automated investigation and response significantly reduces how long a threat sits in an environment before it's contained, limiting potential damage. Attack simulation training is also one of the most effective ways to reduce human risk, giving organizations a safe way to identify which employees may need additional security awareness training before a real attack tests them instead.
Defender for Cloud Apps
Designed for: Organizations that want visibility and control over the growing number of SaaS applications employees use, whether officially sanctioned or not.
What's Included
- Shadow IT discovery, identifying SaaS applications in use across the organization that IT may not be aware of
- SaaS Security Posture Management, assessing the security configuration of connected applications and recommending fixes
- App governance, providing visibility into third-party and AI applications with access to company data, and the ability to revoke risky or over-permissioned access
- Real-time policy enforcement, including the ability to block risky downloads or require additional verification during a session
- Threat protection, detecting suspicious behavior such as unusual login patterns or abnormal data access
- Coverage extending to generative AI applications in use across the organization
Why It Matters for Your Business
Employees today routinely sign up for and connect new SaaS applications and AI tools without IT's knowledge, often granting those applications broad access to company data in the process. Defender for Cloud Apps closes that visibility gap, giving IT and security teams a clear picture of every application in use, how securely each one is configured, and what data it can access. As generative AI tools become part of daily work, coverage extending to AI applications specifically is increasingly important, helping organizations understand and manage a risk category that barely existed just a few years ago.
Summary
- Defender for Office 365 Plan 1 — preventative protection against phishing, malware, and email-based threats, extended across Teams, SharePoint, and OneDrive.
- Defender for Office 365 Plan 2 — adds threat hunting, automated response, and attack simulation training.
- Defender for Cloud Apps — visibility and control across an organization's entire SaaS and AI application landscape.
Together, these solutions protect the two entry points attackers target most often: the inbox and collaboration tools through Defender for Office 365, and the wider universe of SaaS and AI applications through Defender for Cloud Apps.
Have Questions? We're Here to Help.
Our team can help you identify the plan that best matches your organization's needs and guide you through setup.