Introduction
Microsoft 365 E3 and E5 are the two enterprise plans most organizations evaluate once they pass ~300 users or need advanced security and analytics. Both include full Office, Exchange Online, Teams, SharePoint, and baseline Microsoft security services — but the top-tier plan adds a large layer of threat protection, compliance, and business intelligence.
Pricing below matches our published enterprise pricing (per user / month).
E3 vs E5 at a glance
| Enterprise E3 | Enterprise E5 | |
|---|---|---|
| THB / user / mo | ฿1,050 | ฿1,650 |
| SGD / user / mo | S$24 | S$37 |
| Desktop Office | Yes | Yes |
| Exchange Online (Plan 2) | Yes | Yes |
| Teams, SharePoint, OneDrive | Yes | Yes |
| Defender for Office 365 | Plan 1 | Plan 2 |
| Microsoft Intune | Yes | Yes |
| Entra ID P1 | Yes | Yes (P2 features on top tier) |
| Power BI Pro | — | Included |
| Advanced compliance (eDiscovery, audit) | Baseline | Expanded |
| Microsoft Defender for Endpoint | Baseline | Advanced / XDR options |
Use our feature matrix for a column-by-column view across all plans.
When E3 is the right default
E3 is the enterprise productivity + identity baseline:
- Full desktop Office for knowledge workers
- Email, calendaring, and archival headroom with Exchange Online Plan 2
- Teams phone system readiness (licensing for PSTN is separate)
- Intune and Entra ID P1 for device and access management
- Defender for Office 365 Plan 1 (safe attachments/links in email)
Choose E3 if: You need enterprise scale and compliance foundations but already have a SIEM, DLP strategy, or BI platform elsewhere — or you are cost-constrained on per-seat security add-ons.
What the top enterprise tier adds (and who needs it)
E5 is E3 plus advanced security, compliance, and analytics:
- Defender for Office 365 Plan 2 — automated investigation and response for email threats
- Defender for Endpoint Plan 2 — endpoint detection and response (EDR)
- Microsoft Purview advanced compliance — legal hold, eDiscovery, insider risk (where licensed)
- Power BI Pro — self-service analytics for every licensed user
- Entra ID P2 — identity protection, privileged identity management patterns
Choose the E5 SKU if: You are in regulated industries (finance, healthcare, legal), face advanced phishing and ransomware risk, or want Microsoft-native BI without a separate Power BI purchase.
Avoid paying for the top tier if: You will not enable advanced security workloads — many features require security team time to deploy and tune.
Common misconceptions
“The higher plan is just more storage.” No — storage is similar; the jump is security and compliance services.
“We can start on E3 and upgrade seat-by-seat.” Yes, Microsoft supports mixed licensing in a tenant, but plan the upgrade path before audit season.
“Enterprise means unlimited users.” There is no upper cap, but licensing is still per user; frontline and contractor roles may be cheaper on F1/F3 plans.
How this fits Thailand & Singapore operations
- Both markets see strong E3 adoption for regional HQ and shared services.
- Interest in the top enterprise SKU often follows PDPA (Thailand) and PDPA/GST audit (Singapore) pressure plus board-level security mandates.
- We quote E3/E5 in THB or SGD with local tax invoices — see payment options.
Next steps
Common questions
When should we choose E3 over E5?
Choose E3 if you need enterprise productivity, Exchange Online Plan 2, Intune, and Entra ID P1 but already have a SIEM, DLP strategy, or BI platform elsewhere — or you are cost-constrained on per-seat security add-ons.
What does E5 add beyond E3?
E5 adds Defender for Office 365 Plan 2, Defender for Endpoint Plan 2, advanced Microsoft Purview compliance, Power BI Pro for every user, and Entra ID P2 identity protection features.
Is E5 just more storage?
No — storage is similar between E3 and E5. The jump is advanced security, compliance, and analytics services.
Can we mix E3 and E5 licenses in one tenant?
Yes. Microsoft supports mixed licensing in a tenant, but plan the upgrade path before audit season rather than upgrading seat-by-seat reactively.
Does Enterprise licensing mean unlimited users?
There is no upper cap on tenant size, but licensing is still per user. Frontline and contractor roles may be cheaper on F1/F3 plans.
