Microsoft 365 E3 vs E5: What the Upgrade Actually Buys You
The short answer
Microsoft 365 E3 covers the productivity and management core most enterprises need; E5 is an upgrade you buy for a reason, not by default — its value is concentrated in four areas: the full Defender security suite, premium compliance (eDiscovery Premium, Insider Risk, advanced Purview), Entra ID P2 identity protection, and built-in Teams Phone and Power BI Pro. The honest math: if you'd otherwise buy two or more of those as add-ons — or your security team wants Microsoft's full XDR stack — E5 usually pays for itself. If not, E3 plus targeted add-ons for the few people who need them is the better spend.
Choose Microsoft 365 E3 if…
- You need the enterprise core — Office apps, 100 GB mail, Entra P1, Intune, Windows 11 Enterprise — without the premium security bill
- Your security tooling is already covered by a third party (or a SOC you're not replacing)
- Only a small group needs advanced compliance — license those few, not everyone
- Budget predictability matters more than consolidating tools
Choose Microsoft 365 E5 if…
- You want Microsoft's full XDR stack: Defender for Endpoint P2, Office 365 P2, Identity, and Cloud Apps
- You have real compliance exposure — eDiscovery Premium, Insider Risk Management, advanced Purview
- You'd otherwise buy Entra ID P2, Teams Phone, or Power BI Pro as separate add-ons
- You're consolidating security vendors and want one throat to choke
- Your cyber-insurance or auditors keep asking for capabilities E3 doesn't have
Why this comparison even comes up
E5 costs roughly half again as much as E3, so the question is never “is E5 better” — it obviously includes more — but whether *your* organization will use what it adds. The differences concentrate in security depth, compliance tooling, identity, analytics, and voice. Here's the honest breakdown.
Side-by-side: E3 vs E5
| Microsoft 365 E3 | Microsoft 365 E5 | |
|---|---|---|
| Price (current NCE list) | from $39.00 /user/mo annual | from $60.00 /user/mo annual |
| Best for | Enterprise productivity + management core | Security-led and compliance-heavy enterprises |
| Desktop Office apps | ● Included | ● Included |
| Mailbox & archive | ● 100 GB + auto-expanding archive | ● 100 GB + auto-expanding archive |
| Windows edition | Windows 11 Enterprise E3 | Windows 11 Enterprise E5 |
| Identity | ● Entra ID P1 | ● Entra ID P2 (risk-based Conditional Access, PIM) |
| Endpoint security | ● Defender for Endpoint P1 | ● Defender for Endpoint P2 (EDR, threat hunting) |
| Email security | ● Defender for Office 365 P1 (from July 2026) | ● Defender for Office 365 P2 (attack simulation, automated response) |
| Identity threat detection | ○ Not included | ● Defender for Identity |
| Cloud app security | ○ Not included | ● Defender for Cloud Apps |
| DLP & records | ● Full DLP, retention, Audit Standard | ● + advanced Purview, Audit Premium, records management |
| eDiscovery | ● Standard | ● Premium (custodians, review sets, analytics) |
| Insider risk | ○ Not included | ● Insider Risk Management |
| Analytics | ○ Power BI not included | ● Power BI Pro included |
| Voice | ○ Teams Phone not included | ● Teams Phone Standard + audio conferencing |
| Copilot | ● Eligible (add-on) | ● Eligible (add-on) |
Legend: ● Included · ◐ Basic / limited · ◇ Requires prerequisite · ○ Not included · ◷ Preview / conditional
The add-on math most spreadsheets miss
The E5 conversation usually starts with security and ends with arithmetic. Priced separately, Entra ID P2, Defender for Endpoint P2, Power BI Pro, and Teams Phone add up fast — cross two or three of them and the E5 delta stops looking like a premium and starts looking like a bundle discount.
The mistake in the other direction is just as common: buying E5 for everyone because the security team needs it for someone. Licensing is per-user, and mixing is allowed — a 500-person company might run E5 for the 60 people in finance, legal, and IT, and E3 for everyone else. Microsoft's own security add-ons (E5 Security, E5 Compliance) exist precisely for stepping up a subset without the full jump.
One more honest note: E5's security value assumes someone actually operates it. The Defender suite and Insider Risk aren't set-and-forget — if nobody owns the queue, you're paying for dashboards nobody reads. That's an argument for pairing E5 with managed security, or for staying on E3 until the operational side is real.
How to actually decide
Most companies don’t put everyone on one plan. A common, cost-smart pattern: E3 or E5 for the group each genuinely fits, mixed in the same tenant, sized per role. If you’re sizing a mixed environment, start from the subscriptions catalog — or we’ll do it with you on a call.
Frequently asked questions
How much more does E5 cost than E3?
E5 runs roughly 55–60% above E3 per user on current NCE pricing (both shown live on their plan pages). Whether that's expensive depends entirely on how many E5-only capabilities you'd otherwise buy as add-ons.
Can I mix E3 and E5 in one tenant?
Yes, and most organizations should. Put E5 on the users who need premium security, compliance, or voice; keep E3 for the rest. Per-role licensing is normal and fully supported.
What are E5 Security and E5 Compliance add-ons?
They're mini-steps between E3 and E5: E5 Security adds the full Defender suite and Entra ID P2 to an E3 base; E5 Compliance adds the premium Purview capabilities. If you only need one of the two pillars, an add-on on E3 is usually cheaper than full E5.
Does E5 include Microsoft 365 Copilot?
No. Copilot remains a separate paid add-on on both plans — E5 doesn't bundle it.
Is Teams Phone in E5 a complete phone system?
E5 includes Teams Phone Standard and audio conferencing, but you still need PSTN connectivity — a Microsoft Calling Plan, Operator Connect, or Direct Routing — for actual phone numbers and outside calls. That's a separate per-user cost on any plan.
Do auditors or cyber-insurance requirements force E5?
Not by name, but the capabilities they ask for — EDR everywhere, privileged identity management, insider-risk monitoring, defensible eDiscovery — map heavily onto E5 or the E5 Security/Compliance add-ons. Bring the questionnaire to a licensing review; sometimes E3 plus one add-on satisfies it.
Can IT Partner help us decide who actually needs E5?
Yes — that's the normal starting point. We map roles to capabilities, price the E3+add-on alternative against full E5, and hand you the comparison. Same Microsoft price either way; you just avoid paying for shelf-ware.
Buy either plan through IT Partner — same Microsoft price, more on your side
Whichever plan is right for you, the price from Microsoft is the same whether you buy direct or through us. The difference is what comes with it: a Microsoft partner of 20 years, on the first page of Microsoft's directory for responsiveness, a real person who picks up when something breaks, and a team that makes sure you’re not over- or under-licensed in the first place.
What happens next: a short readiness check → a plain recommendation (often a mix, not one plan) → transfer or provisioning with no interruption → rollout and training if you need it → a real person on support afterward.