What is the difference between Microsoft 365 E3 and E5 security?
Microsoft 365 E5 includes everything in E3 plus advanced threat detection, automated investigation and response, identity risk protection, and AI-powered security operations (Security Copilot).
E3 focuses on prevention, while E5 adds detection and response.
TL;DR
Choosing between Microsoft 365 E3 and E5 comes down to how proactive your security strategy needs to be.
- E3 helps you prevent threats.
- E5 helps you detect, investigate, and respond faster—at scale, with AI.
Talk to a ProArch expert to choose the right Microsoft 365 plan
E3 vs. E5 Security Comparison
| Area | Microsoft 365 E3 | Microsoft 365 E5 |
| Email security | Basic filtering | Advanced threat protection + response |
| Endpoint security | Device protection | Detection + investigation + remediation |
| Identity security | MFA, access control | Risk detection + privileged access control |
| Data protection | Core DLP + manual labels | Auto-labeling + insider risk + endpoint DLP |
| Threat detection |
Limited visibility | Unified visibility across systems |
| Response | Manual | Automated + AI-assisted (Security Copilot) |
What does Microsoft 365 E3 include for security?
Microsoft 365 E3 provides foundational security across email, devices, identity, and data:
Email security
-
Spam and malware filtering (Exchange Online Protection)
- Basic phishing protection
Device (endpoint) security
-
Antivirus and device protection
-
Tools to reduce attack surface
Identity security
-
Multi-factor authentication (MFA)
-
Conditional Access (control who can sign in and from where)
Data protection
-
Data loss prevention (email, SharePoint, OneDrive)
-
Manual sensitivity labels
-
Basic auditing and compliance tools
Bottom line:
E3 helps you protect against known threats and control access.
What does Microsoft 365 E5 include that E3 does not?
Microsoft 365 E5 builds on E3 and adds advanced, automated, and AI-driven security capabilities:
Advanced email security
-
Protection against sophisticated phishing and impersonation attacks
-
Threat investigation tools
-
Automated response to email-based threats
Advanced endpoint security
-
Detection of suspicious behavior on devices
-
Threat hunting and investigation tools
-
Automated remediation of attacks
Advanced identity security
-
Detection of compromised accounts
-
Risk-based access (block or limit risky users automatically)
-
Privileged access controls for admins
Advanced data protection
-
Automatic classification of sensitive data
-
Data protection on devices (not just in M365 apps)
-
Insider risk detection (flag risky user behavior)
AI-powered security operations (Security Copilot)
-
Built-in AI assistant for security teams
-
Summarizes incidents and alerts
-
Correlates threats across systems
-
Suggests investigation steps and responses
-
Reduces manual analysis time
Bottom line:
E5 helps you detect, investigate, and respond to real attacks in progress.
What’s the difference between E3 and E5 security overall?
E3 = prevention
-
Block threats
-
Control access
-
Apply policies
E5 = prevention + detection + response
-
Identify suspicious behavior
-
Investigate incidents
-
Respond automatically
-
Use AI to speed up analysis
Not sure if E3 or E5 is the right fit?
Let’s help you choose the best Microsoft 365 Licensing plan for your business needs- security, budget, and growth goals included.
When should you upgrade from E3 to E5?
You should upgrade from Microsoft 365 E3 to E5 when you need:
-
Threat detection and response (not just prevention)
-
Visibility into user behavior and data risk
-
Faster incident response
-
Greater control as your environment grows
When should you choose E3 vs E5?
Choose Microsoft 365 E3 if:
-
You need baseline security and access control
-
You rely on third-party tools for advanced protection
-
Your security requirements are moderate
Choose Microsoft 365 E5 if:
-
You need advanced threat detection and response
-
You want to reduce reliance on multiple security tools
-
You need visibility into user behavior and data risk
-
You are preparing for increased data usage (including AI)
How does AI impact the E3 vs E5 decision?
AI tools like Microsoft 365 Copilot increase the importance of security because they surface existing data and permissions.
E5 helps manage this risk with better visibility, automation, and AI-assisted investigation.
Where does Microsoft 365 E7 fit?
Microsoft 365 E7 builds on E5 and focuses on governing AI at scale.
-
E5 = security foundation
-
E7 = security + AI governance and control across users and agents
E7 becomes relevant when:
-
AI usage expands across teams
-
Organizations need visibility into AI activity
-
Governance needs to extend beyond users to AI systems
Final takeaway
The E3 vs E5 decision is not just about features.
It’s about how you manage risk:
-
E3 protects what you already know
-
E5 helps you detect what you don’t
As organizations adopt AI, the difference becomes clearer—because AI makes security gaps more visible, faster.
Not sure if E3 is enough—or if E5 is worth it?
We help you align Microsoft 365 licensing with your security, compliance, and AI adoption goals.
As a top Microsoft Partner, we can help you to:
- Assess your current security posture
- Identify gaps across identity, data, and endpoints
- Determine if E3 or E5 aligns with your environment
Let’s build your Microsoft security strategy together. Reach out to us.
