Is Office 365 E3 obsolete in 2026? Why it fits neither small nor large organizations
For most organizations, yes. Office 365 E3 is still sold and updated, but it has stopped being a sensible default. On the November 2026 price list it is $26.00 per user per month. Microsoft 365 Business Premium is $22.00, is available up to 300 users, and includes Conditional Access, Intune and endpoint protection, which Office 365 E3 lacks. Above 300 users, adding Enterprise Mobility + Security E3 for the first two costs $38.00 in total, one dollar under Microsoft 365 E3, which includes all three. Office 365 E3 is still the right purchase in a few specific cases.
The position: a plan to choose on purpose, not by default
Office 365 E3 was built as the enterprise productivity suite: desktop apps, a large mailbox, files and meetings. It was never the identity, device management or endpoint security layer, and in 2026 those layers are what insurance questionnaires, Copilot rollouts and Microsoft's own add-on prerequisites assume. An organization with 300 users or fewer gets them in Business Premium, at a lower list price on the Teams-included SKUs. A larger one has to add them, and Microsoft's Product Terms name the result: Microsoft 365 E3 is Office 365 E3, Enterprise Mobility + Security E3 and Windows 11 Enterprise E3 in one license. Our position: Office 365 E3 should be a deliberate exception with a written reason. Each step below cites a Microsoft document or the November 2026 price list; one section argues the other side.
What Office 365 E3 is in 2026
Microsoft's service plan reference, dated 18 August 2026, lists what an Office 365 E3 license switches on: Microsoft 365 Apps for enterprise, Exchange Online (Plan 2), SharePoint (Plan 2), Teams, Information Protection for Office 365 (Standard) and Mobile Device Management for Office 365, among others.
Three things changed between November 2025 and November 2026:
- Price. On 1 July 2026 the list price went from $23.00 to $26.00. Existing customers move to it at their first renewal after that date (2026 price and packaging changes).
- Packaging. The same update added Microsoft Defender for Office 365 Plan 1.
- Teams. Microsoft stopped selling enterprise suites with Teams to new customers in April 2024 and reversed that on 1 November 2025, when its licensing FAQ says they became available to all customers worldwide again. Our catalog lists both versions; $26.00 is the Teams-included price, and Microsoft's FAQ sets the minimum gap at $8.55.
What the plan lacks is unchanged: no Microsoft Entra ID P1, no Intune Plan 1, no Defender endpoint product and no Windows rights. Its Mobile Device Management service is Basic Mobility and Security, which Microsoft calls a limited subset of Intune. Office 365 E1 vs E3 vs Microsoft 365 E3 compares all three suites.
Up to 300 users: Office 365 E3 against Business Premium
Microsoft's Product Terms limit Microsoft 365 Business Premium to 300 user licenses. The comparison as of November 2026:
| Office 365 E3 | Business Premium | |
|---|---|---|
| List price per user per month | $26.00 | $22.00 |
| Desktop apps | Apps for enterprise | Apps for business |
| Primary mailbox | 100 GB | 100 GB since 2026 |
| Archive mailbox and hold | Yes | Yes |
| OneDrive per user, default | 1 TB | 1 TB |
| Defender for Office 365 Plan 1 | Yes, since July 2026 | Yes |
| Manual sensitivity labels, data loss prevention, eDiscovery (Standard) | Yes | Yes |
| Entra ID P1 and Conditional Access | No | Yes |
| Intune Plan 1 | No | Yes |
| Endpoint protection | No | Defender for Business |
| Windows | No | Windows Business |
On list prices (annual commitment, billed annually), $26.00 minus $22.00 is $4.00 per user per month, or $48.00 per user per year. That is the Teams-included comparison. On the no-Teams SKUs the order reverses: Office 365 E3 (no Teams) is $17.45 and Business Premium (no Teams) is $18.79 per user per month, $1.34 more for the plan that includes the identity, device and endpoint layers.
The classic reasons for E3 have weakened. Microsoft's 2026 update added 50 GB to the Business plan mailbox; its Exchange team explained in August 2026 that the primary mailbox becomes 100 GB, rolled out through September 2026. Under the Product Terms both app editions carry the same install rights, and shared computer activation is allowed for Apps for business inside Business Premium. Business Premium vs E3 covers the Microsoft 365 E3 side; the Plan Optimizer prices a mix by role.
Above 300 users: what has to be added, and what it costs
Past 300 users Business Premium stops (how the cap is counted), so the gaps in Office 365 E3 are filled with add-ons. Microsoft's Entra licensing page lists Entra ID P1 inside Microsoft 365 E3, E5 and E7, Microsoft 365 F1 and F3, Enterprise Mobility + Security E3 and Business Premium. No Office 365 plan is on that list.
Enterprise Mobility + Security E3 is the add-on for identity and devices: Entra ID P1, Intune Plan 1 and Azure Information Protection P1, plus Intune Plan 2, Remote Help and Advanced Analytics since the 2026 packaging update. On the November 2026 price list:
- Office 365 E3 at $26.00 plus Enterprise Mobility + Security E3 at $12.00 is $38.00 per user per month.
- Microsoft 365 E3 is $39.00.
The remaining dollar buys Windows 11 Enterprise E3 and Defender for Endpoint Plan 1.
The next tier has the same floor. Microsoft's security pricing page states that the Microsoft Defender Suite and the Microsoft Purview Suite each require Microsoft 365 E3, or Office 365 E3 and Enterprise Mobility + Security E3. Office 365 E3 alone qualifies for neither. Our Enterprise Mobility + Security article covers where the bundle is the right add-on.
Security and cyber insurance questionnaires
Insurance questionnaires ask about controls, but each control needs a license underneath it. Our cyber insurance questionnaire article covers the question areas. Against four of them, Office 365 E3 gives you this:
- MFA. Security defaults, available to every customer, switch MFA on for the whole tenant. Conditional Access, for exceptions, device conditions and administrator rules, needs Entra ID P1.
- Endpoint detection and response. Nothing. Business Premium includes Defender for Business, which Microsoft describes as equivalent to Defender for Endpoint Plan 1 with some features from Plan 2, endpoint detection and response among them. Microsoft 365 E3 includes Plan 1, which is prevention (our Defender comparison).
- Device encryption and patch evidence. These reports come from Intune, which the plan lacks.
- Email filtering. Covered since July 2026 by Defender for Office 365 Plan 1.
A license is not a control until someone configures it, and what an answer means for coverage is your broker's question. The licensing point is narrower: Office 365 E3 fully answers one of these four areas and partly answers a second.
Copilot and AI readiness
Eligibility is not the problem. Microsoft's license options article (1 December 2025) lists Office 365 E3 as a qualifying base plan for Microsoft 365 Copilot, the $30.00 add-on. The $21.00 Copilot Business add-on is sold only to customers on the Microsoft 365 Business plans, up to 300 seats per tenant, so an Office 365 E3 user cannot buy it.
Readiness is the problem. Copilot answers from whatever the signed-in user is allowed to open. Microsoft's Zero Trust guidance for Copilot includes Conditional Access policies and Intune app protection among its steps, and Office 365 E3 has neither. SharePoint Advanced Management comes with the Copilot license itself, whatever the base plan. Our Copilot readiness checklist lists the rest.
Agents widen the gap. Microsoft's licensing FAQ for Agent 365 ($15.00) lists, apart from Microsoft 365 E7 and the education and frontline options, three routes: Microsoft 365 E5 or Business Premium plus Agent 365; Microsoft 365 E3 plus the Defender and Purview Suites plus Agent 365; or Office 365 E3 plus Enterprise Mobility + Security E3 plus both suites plus Agent 365. The same FAQ says Business Premium customers need the Business Premium versions of both suites to unlock Agent 365 functionality. Copilot licensing and pricing has the base-plan list. The license itself is explained in Microsoft Agent 365: what it does, how it is licensed and who needs a license, and the case for one license that carries E5, Copilot and Agent 365 in Microsoft 365 E7 as the one license.
Where Office 365 E3 is still the right purchase
The argument fails in specific cases.
- More than 300 users, with identity, device management and endpoint protection already bought from other vendors and working. Microsoft 365 E3 would pay for those layers a second time, so Office 365 E3 is the correct productivity license. The cost of that choice: the Defender Suite, the Purview Suite and Agent 365 all require Enterprise Mobility + Security E3 beside Office 365 E3.
- A subscription that is mid-term. An annual commitment cannot be reduced before renewal, so unless you take the mid-term upgrade to Microsoft 365 E3 described in the next section, staying until the renewal date is the right decision even when the plan is not.
- A named requirement for an enterprise service plan, under 300 users. Exchange Online (Plan 2), SharePoint (Plan 2) and Apps for enterprise are not in Business Premium. If a requirement depends on one, check it in the plan components tool and keep the enterprise plan for those users.
- Users who still connect to on-premises Exchange, SharePoint or Skype for Business servers. Microsoft's Product Terms treat an Office 365 E3 license as equivalent to the client access licenses for the Subscription Edition of those servers. Business Premium is not in that equivalency table, so those users would need client access licenses from another source.
Fairness notes: we found no Microsoft announcement of an end of sale for Office 365 E3, and every price here is the Commercial list; nonprofit, education and government lists differ.
Moving off it, mid-term or at renewal
Under Microsoft's New Commerce Experience rules, a license-based subscription can be reduced or cancelled only within seven calendar days of purchase or renewal; after that the seats are committed to the end of the term (NCE explained).
To Microsoft 365 E3: possible mid-term. Partner Center defines an upgrade as a move from one paid subscription to another on a higher tier, for all or part of the seats. Office 365 E3 to Microsoft 365 E3 is that kind of move; ask your partner to confirm it in Partner Center for your subscription.
To Business Premium: plan it for the renewal. It is a lower-priced plan in a different family, and we found no Microsoft page that lists it as an upgrade path. Microsoft's plan-change documentation (8 April 2026) gives the manual route: buy the second subscription, move the users, then end the first.
- Sixty days before renewal, confirm 300 or fewer seats and check mailbox sizes against 100 GB.
- Pilot the license change on a few users.
- Start Business Premium on the renewal date and switch off auto-renewal on Office 365 E3.
The Microsoft 365 License Audit and Optimization service ($1,950 per project, one week, fixed price) models the mix across Business Premium, E3 and E5 and maps each change to your renewal calendar. The free Microsoft 365 Tenant Health Check is a lighter first read; the cost calculator prices each commitment term.
Frequently asked questions
Is Office 365 E3 being discontinued?
We found no Microsoft announcement of an end of sale. On 1 July 2026 Microsoft raised the list price to $26.00 and added Defender for Office 365 Plan 1, and since 1 November 2025 it sells the Teams-included suite to all customers again. Our argument is about fit, not support.
Does Office 365 E3 include Teams?
It depends on the SKU. Microsoft sells Office 365 E3 with and without Teams, and since 1 November 2025 both are open to all customers worldwide. The $26.00 list price is the Teams-included SKU. No-Teams customers add Microsoft Teams Enterprise at $8.55 per user per month (November 2026 price list).
Does Office 365 E3 include Intune or Conditional Access?
No. In Microsoft's service plan reference of 18 August 2026 the plan carries Mobile Device Management for Office 365, not Intune Plan 1, and no Microsoft Entra ID P1. Conditional Access and Intune Plan 1 come with Business Premium, Enterprise Mobility + Security E3 or Microsoft 365 E3.
Can we add Microsoft 365 Copilot to Office 365 E3?
Yes. Microsoft lists Office 365 E3 as a qualifying base plan for the Microsoft 365 Copilot add-on, $30.00 per user per month (November 2026 price list). The $21.00 Copilot Business add-on is limited to the Microsoft 365 Business plans and cannot be attached to Office 365 E3.
Can we switch from Office 365 E3 to Business Premium before the renewal date?
You can buy Business Premium and reassign users any day, but the Office 365 E3 seats stay committed to the end of their term: reductions are allowed only in the seven days after purchase or renewal. For most organizations the change belongs on the renewal date.
Sources
- Product names and service plan identifiers for licensing — Microsoft Learn, 18 August 2026
- Microsoft 365 pricing and packaging updates — Microsoft, 16 February 2026
- Microsoft Licensing FAQs: Microsoft Teams — Microsoft, checked 2026-11-11
- Product Terms: Microsoft 365 — Microsoft, checked 2026-11-11
- Product Terms: Microsoft 365 Applications — Microsoft, checked 2026-11-11
- Product Terms: CAL and ML Equivalency Licenses — Microsoft, checked 2026-11-11
- Microsoft Entra licensing — Microsoft Learn, 18 June 2026
- Microsoft 365 for business security overview — Microsoft Learn, 30 September 2025
- Microsoft Purview licensing guidance — Microsoft, checked 2026-11-11
- Microsoft Security pricing overview — Microsoft, checked 2026-11-11
- License options for Microsoft 365 Copilot — Microsoft Learn, 1 December 2025
- Microsoft 365 Copilot Business FAQ — Microsoft Learn, 1 December 2025
- Secure and govern Microsoft 365 Copilot: Foundational deployment guidance — Microsoft Learn, 8 April 2026
- Apply principles of Zero Trust to Microsoft 365 Copilot — Microsoft Learn, search excerpts, checked 2026-11-11
- Microsoft Licensing FAQs: Microsoft Agent 365 — Microsoft, checked 2026-11-11
- Upgrade or change to a different Microsoft 365 for business plan — Microsoft Learn, 8 April 2026
- New commerce experience cancellation policy — Microsoft Learn, search excerpts, checked 2026-11-11
- Understanding the new 100 GB mailbox entitlement for Microsoft 365 Business suites — Microsoft Tech Community, August 2026, search excerpts
- Office 365 E3 plan page — IT Partner, November 2026 price list
Key takeaways
- On the November 2026 price list Office 365 E3 is $26.00 and Microsoft 365 Business Premium is $22.00 per user per month; Business Premium is limited to 300 user licenses and adds Entra ID P1, Intune Plan 1 and Defender for Business.
- Since Microsoft's 2026 packaging update the Business Premium primary mailbox is 100 GB and Office 365 E3 includes Defender for Office 365 Plan 1, so the two plans are level on mailbox size and email protection.
- Office 365 E3 plus Enterprise Mobility + Security E3 is $38.00 per user per month against $39.00 for Microsoft 365 E3, which also includes Windows 11 Enterprise E3 and Defender for Endpoint Plan 1.
- The Microsoft Defender Suite, the Microsoft Purview Suite and Agent 365 all require Enterprise Mobility + Security E3 alongside Office 365 E3; Office 365 E3 alone qualifies for none of them.
- Office 365 E3 qualifies for the $30.00 Microsoft 365 Copilot add-on but not for the $21.00 Copilot Business add-on, and it lacks the Conditional Access and Intune controls that Microsoft's Zero Trust guidance for Copilot calls for.
- Office 365 E3 remains the right purchase above 300 users when identity, device management and endpoint protection come from other vendors, and until renewal for a mid-term subscription that is not upgraded to Microsoft 365 E3; a move to Business Premium belongs on the renewal date.
Before your renewal, the Microsoft 365 License Audit and Optimization service ($1,950 per project, one week) checks every assigned license against evidence of use and models a right-sized plan mix across Business Premium, E3 and E5 for each group of users.
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