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.
Choosing between Microsoft 365 E3 and E5 comes down to how proactive your security strategy needs to be.
Talk to a ProArch expert to choose the right Microsoft 365 plan
| 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) |
Microsoft 365 E3 provides foundational security across email, devices, identity, and data:
Spam and malware filtering (Exchange Online Protection)
Antivirus and device protection
Tools to reduce attack surface
Multi-factor authentication (MFA)
Conditional Access (control who can sign in and from where)
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.
Microsoft 365 E5 builds on E3 and adds advanced, automated, and AI-driven security capabilities:
Protection against sophisticated phishing and impersonation attacks
Threat investigation tools
Automated response to email-based threats
Detection of suspicious behavior on devices
Threat hunting and investigation tools
Automated remediation of attacks
Detection of compromised accounts
Risk-based access (block or limit risky users automatically)
Privileged access controls for admins
Automatic classification of sensitive data
Data protection on devices (not just in M365 apps)
Insider risk detection (flag risky user behavior)
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.
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
Let’s help you choose the best Microsoft 365 Licensing plan for your business needs- security, budget, and growth goals included.
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
You need baseline security and access control
You rely on third-party tools for advanced protection
Your security requirements are moderate
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)
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
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.
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:
Let’s build your Microsoft security strategy together. Reach out to us.