Choosing between Microsoft 365 Business Premium vs E3 vs E5 depends on company size and how much advanced security and compliance you need. Business Premium is designed for organizations up to 300 users and bundles productivity apps with strong security such as Intune, Entra ID P1 and Defender for Business. E3 is the enterprise baseline with no user cap and core security and compliance. E5 adds advanced threat protection, Entra ID P2, advanced compliance and analytics. Many organizations mix plans by role to control costs.
Key Takeaways
- Business Premium: up to 300 users, excellent value for SMB security.
- E3: enterprise productivity and core security with no seat cap.
- E5: advanced security, compliance, voice and analytics for high-risk or regulated environments.
- Add-ons can bridge gaps without upgrading every user to E5.
- Teams packaging and pricing vary by region and agreement; confirm with your licensing partner.
Comparison Table
| Capability | Business Premium | E3 | E5 |
|---|---|---|---|
| User limit | 300 | No cap | No cap |
| Office apps, Exchange, SharePoint, OneDrive | Yes | Yes | Yes |
| Intune device management | Yes | Yes | Yes |
| Entra ID | P1 | P1 | P2 (risk-based access, PIM) |
| Endpoint protection | Defender for Business | Defender for Endpoint P1 | Defender for Endpoint P2 |
| Email security | Defender for Office 365 P1 | Exchange Online Protection | Defender for Office 365 P2 |
| Compliance | Core DLP, sensitivity labels | Core compliance | Advanced Purview (insider risk, eDiscovery Premium, auto-labeling) |
| Voice and analytics | Add-ons | Add-ons | Teams Phone and Power BI Pro included in many offers |
Microsoft changes packaging periodically, so validate features against current Microsoft service descriptions.
Which Plan Fits Your Organization?
Business Premium
Ideal for companies under 300 users who want enterprise-grade security without enterprise pricing. It covers MFA, Conditional Access, Intune and EDR.
E3
Fits larger organizations, or those approaching 300 users, that need unlimited scale and core security, and may add specific security add-ons.
E5
Fits regulated industries, organizations with security operations teams, and those needing advanced compliance, insider risk and identity protection.
Smart Licensing Strategies
- Mix plans: E5 for admins, executives and finance; E3 or Business Premium for others (within plan rules).
- Use add-ons: E5 Security or E5 Compliance add-ons on top of E3.
- Frontline plans: F1/F3 for shift and frontline workers.
- Remove unused licenses: recover licenses from leavers and inactive accounts.
- Use what you pay for: many organizations own E5 features they never deploy.
Signs You Are Over- or Under-Licensed
- Paying for E5 but not using Defender, Purview or Entra ID P2 features.
- Buying separate third-party tools that duplicate included features.
- Running Business Premium above 300 users through workarounds.
- Lacking risk-based Conditional Access while handling sensitive data.
For migration budgeting, see Microsoft 365 migration cost; for endpoint choices, see Defender for Business vs Defender for Endpoint.
Replacing your phone system as well? Teams Phone licensing works alongside these plans. Compare Calling Plans, Operator Connect and Direct Routing before you finalize licenses.
How Skytech Enterprise Helps
Our Microsoft 365 license optimization service analyzes usage and features to recommend the right mix, and our tenant management team helps you use what you pay for. Request a license review.
Frequently Asked Questions
What is the main difference between E3 and E5?
E5 adds advanced security (Defender for Endpoint P2, Defender for Office 365 P2, Entra ID P2), advanced compliance tools and, in many offers, voice and analytics capabilities.
Is Business Premium better than E3?
For organizations under 300 users, Business Premium often provides stronger built-in security value than E3. E3 is needed above 300 users or for specific enterprise features.
Can we mix Business Premium and E3 licenses?
Mixing business and enterprise plans is possible in a tenant, but Business plans remain capped at 300 seats. Confirm eligibility with your licensing partner.
Does E3 include Microsoft Defender?
E3 includes Defender for Endpoint Plan 1 and Exchange Online Protection; advanced plans are in E5 or add-ons.
Is Copilot included in E3 or E5?
Microsoft 365 Copilot is licensed as a separate add-on to eligible plans such as Business Premium, E3 and E5.
How often should licenses be reviewed?
Review licenses at least quarterly and before every renewal to remove waste and align plans with real usage.