Microsoft 365 Copilot is available as an add-on to both E3 and E5. E5 is not required to use Copilot. The choice between E3 and E5 depends on your security, compliance, and analytics needs, not on Copilot access. You can add Copilot to an E3 tenant without upgrading to E5.
What Copilot requires, regardless of plan
Microsoft 365 Copilot is licensed per user as an add-on. The base requirements are the same whether your organization is on E3 or E5:
- A qualifying Microsoft 365 base plan (E3, E5, Business Premium, or Business Standard for SMBs)
- Microsoft Entra ID (included in all qualifying plans)
- Microsoft Teams (required for Teams Copilot features)
- SharePoint and OneDrive enabled for content grounding
The Copilot add-on itself costs the same per user regardless of whether the base plan is E3 or E5.
E3 vs E5: what actually differs
The differences between E3 and E5 are in the security, compliance, and analytics layers, not in Copilot feature availability.
| Capability | E3 | E5 |
|---|---|---|
| Microsoft 365 Copilot add-on | Available | Available |
| Copilot Studio (custom agents) | Available (add-on) | Available (add-on) |
| Microsoft Purview (advanced) | Basic only | Full suite included |
| Microsoft Defender for Endpoint P2 | Not included | Included |
| Microsoft Sentinel / SIEM integration | Add-on required | Included |
| Power BI Pro | Not included | Included |
| Entra ID Governance | Add-on required | Included |
When E3 + Copilot is the right choice
E3 with the Copilot add-on is the right starting point for most commercial organizations that:
- Need Copilot in Word, Excel, Outlook, Teams, and PowerPoint
- Want Copilot-summarized emails, meeting recaps, and document drafting
- Are evaluating Copilot before committing to a larger licensing change
- Already have adequate security tooling from existing investments or third-party vendors
When E5 adds meaningful value alongside Copilot
E5 becomes the better choice when your organization also needs:
- Advanced Microsoft Purview for data classification, eDiscovery, and insider risk management, especially if Copilot will access sensitive content
- Microsoft Defender for Endpoint P2 for device security, eliminating a separate MDR contract
- Power BI Pro for analytics without an additional licensing line
- A consolidated security stack under a single vendor agreement
If you are adding Copilot specifically to improve productivity in standard Microsoft 365 workloads, E3 is a perfectly adequate base. Upgrading to E5 to "unlock" Copilot is not necessary and adds cost without adding Copilot functionality.
What this means for implementation
Before rolling out Copilot on E3, the most important configuration steps are the same regardless of plan: sensitivity labels deployed across in-scope content, SharePoint permissions reviewed and tightened so Copilot does not surface content users should not see, and a clear acceptable-use policy documented. These are governance steps, not plan-tier steps.