Microsoft 365 Business Premium vs E3: What You Actually Get (2026)
For a 5–50 person business, Microsoft 365 Business Premium is almost always the better buy than Microsoft 365 E3. It costs less, and in some areas it actually includes more security. Here's what each plan includes, where E3 really wins, and how to decide.
The short answer
- Pick Business Premium if you have fewer than 300 users and your main goals are secure email, files, Teams, and managed Windows PCs. That covers nearly every small business.
- Consider E3 if you're heading past 300 users, need Windows Enterprise features (see below), or have a compliance or contract requirement that names an enterprise plan.
- You can mix, within limits. The 300-seat cap is not per plan: Microsoft's Business Premium FAQ says a tenant can provision up to 300 seats total across Business Basic, Business Standard, and Business Premium combined. Microsoft also says Business Premium can be combined with other subscriptions (such as Office 365 and Enterprise Mobility + Security plans), and it points organizations with more than 300 users to the enterprise plans. So a tenant can hold Business Premium for most people and enterprise licenses for others.
Price
| Plan (with Teams) | Before July 1, 2026 | From July 1, 2026 (as of October 2026) |
|---|---|---|
| Microsoft 365 Business Premium | $22.00 | $22.00 (no change) |
| Microsoft 365 E3 | $36.00 | $39.00 |
Source: Microsoft's Microsoft 365 pricing and packaging updates page. Microsoft says existing customers keep their current price until renewal. Versions without Teams are also sold, at lower prices (for example, $18.79 for Business Premium without Teams and $30.45 for Microsoft 365 E3 without Teams, as of October 2026). Microsoft's Business Premium product page also showed $22.00 user/month, paid yearly, when this was checked.
The gap is $17 per user per month at list price. For a 25-person office, that's 25 × $17 × 12 = $5,100 a year. E3 has to deliver something specific to be worth that.
Side by side: what you actually get
| Area | Business Premium | Microsoft 365 E3 |
|---|---|---|
| User limit | Up to 300 users | No Business-style cap |
| Office apps | Microsoft 365 Apps for business (desktop Word, Excel, PowerPoint, Outlook, etc.) | Microsoft 365 Apps for enterprise |
| Mailbox | 100 GB mailbox; archive auto-expanding up to 1.5 TB (per Microsoft's current Exchange Online limits page) | 100 GB mailbox; archive auto-expanding up to 1.5 TB |
| Identity | Microsoft Entra ID P1 (Conditional Access, group-based licensing) | Microsoft Entra ID P1 |
| Device management | Microsoft Intune Plan 1 | Microsoft Intune Plan 1, plus Intune Plan 2, Remote Help, and Advanced Analytics (added to E3 in Microsoft's summer 2026 packaging update) |
| Endpoint security | Microsoft Defender for Business (includes endpoint detection and response) | Microsoft Defender for Endpoint Plan 1 (no full EDR; Plan 2 comes with E5) |
| Email security | Defender for Office 365 Plan 1 | Defender for Office 365 Plan 1, included starting July 1, 2026 |
| Windows | Windows for business, which Microsoft's Business Premium FAQ defines as Windows 11 Pro and Windows 11 Pro for Workstations | Windows Enterprise E3 |
| Windows Autopatch / hotpatch | Included (Autopatch support requests aren't, per Microsoft Learn); hotpatch needs Windows 11 24H2 or later | Included |
| Information protection / DLP | Purview data loss prevention for Exchange Online, SharePoint, and OneDrive; manual sensitivity labeling; retention labels; Audit (Standard) | The same core set (DLP for Exchange, SharePoint, and OneDrive; manual sensitivity labeling; retention labels; Audit (Standard)). Neither plan includes Endpoint DLP or Audit (Premium). Microsoft's Purview service description lists Endpoint DLP for Microsoft 365 E5 and the enterprise Purview Suite, not for Business Premium. Audit (Premium) can be added to Business Premium with Purview Suite for Business Premium. |
The surprise: Business Premium's endpoint security is stronger
This is the point most comparison articles bury. Microsoft describes Defender for Business as an endpoint security solution built on Defender for Endpoint and designed for organizations up to 300 users. Microsoft's Business Premium FAQ lists endpoint detection and response, automated investigation, and threat and vulnerability management as part of what you get.
E3 includes Defender for Endpoint Plan 1, which is mainly next-generation antivirus and attack surface reduction. To get comparable detection and response on E3, you'd typically add Defender for Endpoint Plan 2, E5 Security, or move to E5.
On email, the gap closed on July 1, 2026. Microsoft's Defender for Office 365 service description says Plan 1 (Safe Links, Safe Attachments, anti-phishing) is now included in Microsoft 365 E3 as well as Business Premium.
So for a small business, moving from Business Premium to E3 can mean paying about 77% more per user and getting weaker endpoint protection, unless you add more licensing.
Where E3 actually wins
1. More than 300 users
Business plans cap at 300 users. If you're at 250 and hiring fast, think about where you'll be at renewal.
2. Windows Enterprise features
E3 includes Windows Enterprise E3. Microsoft's Windows commercial licensing overview lists these Windows 11 features as needing Enterprise rather than Pro:
- Credential Guard, which protects against credential theft such as pass-the-hash. Microsoft's Credential Guard overview lists Windows Enterprise E3/E5 (not Pro) as granting the license entitlement.
- Personal Data Encryption
- Windows experience customization
- Organizational messages (a cloud-based feature)
- 36 months of support for each annual feature update (a licensing use right). Pro and Business editions get 24 months, as the dates on Microsoft's Windows 11 release information page show.
Many features people assume are Enterprise-only, such as Windows Autopatch, modern BitLocker management, Always On VPN, and subscription activation, are listed as available on Pro too. If a specific Enterprise-only feature is a hard requirement (from an auditor, a cyber-insurance questionnaire, or your own risk analysis), that's a real reason for E3. Feature licensing shifts over time, so check Microsoft's current table.
3. More Intune features
Microsoft's summer 2026 packaging update added Intune Plan 2, Intune Remote Help, and Intune Advanced Analytics to Microsoft 365 E3. Business Premium didn't get those additions. If you'd otherwise buy Remote Help as an add-on, factor that into the comparison.
4. Enterprise compliance and add-on paths
Microsoft's subscription suites licensing guidance says the enterprise Defender Suite (formerly Microsoft 365 E5 Security) and Purview Suite (formerly E5 Compliance) require Microsoft 365 E3, or Office 365 E3 plus Enterprise Mobility + Security E3. Business Premium has its own versions: Defender Suite for Business Premium and Purview Suite for Business Premium, which require Business Premium and are capped at 300 users. So a Business Premium tenant can still add advanced security or compliance without moving to E3. One licensing quirk Microsoft calls out: Defender for Business doesn't support mixed licensing, so a tenant with both Defender for Business and Defender for Endpoint Plan 2 defaults to the Defender for Business experience. Check the prerequisites for the specific add-on you're considering.
5. Apps for enterprise
E3 includes Microsoft 365 Apps for enterprise rather than Apps for business. For most offices the day-to-day difference is minimal. Two differences Microsoft documents:
- Policy management: the Cloud Policy service lets you create a policy configuration for Apps for business, but only privacy-control settings are supported. Apps for enterprise gets the full set of Office policy settings.
- Shared computer activation: Business Premium is the only business plan that supports it, so this is not a reason to move to E3. One catch: Apps for business can't use Group Policy to turn it on, so use the registry setting, the Office Deployment Tool, or Intune instead.
A decision checklist
- Will you exceed 300 users within the next renewal term? If yes, plan for E3 (or a mix). If no, continue.
- Is there a written requirement for an Enterprise-only Windows feature or an enterprise plan by name? If yes, license E3 for the people or devices it applies to. If no, continue.
- Do you need EDR on endpoints? Business Premium includes it via Defender for Business. E3 needs an add-on.
- Do you need Conditional Access and Intune? Both plans include them. E3 adds Intune Plan 2, Remote Help, and Advanced Analytics.
- If you got here, choose Business Premium.
What about Business Standard?
Business Standard ($14 from July 1, 2026) gets you the apps, email, and Teams, but not Intune, Entra ID P1, Defender for Business, or Defender for Office 365 Plan 1. (Microsoft's summer 2026 packaging update gave Business Standard URL time-of-click protection, but not the rest of Defender for Office 365 Plan 1.) In practice, that means no Conditional Access and no device management. The $8 difference to Business Premium is the best-value security upgrade most small businesses can buy, and it's the plan the other guides on this site assume.
Buying tips
- Annual commitment vs. monthly: monthly-commitment billing usually costs more per user. Annual commitment locks your seat count for the term. Know your reseller's rules on reducing seats. If you bought through GoDaddy and want to buy from Microsoft instead, see How to move Microsoft 365 off GoDaddy.
- Don't over-license everyone: a shared mailbox doesn't need a license (up to 50 GB per Microsoft's limits). Frontline or kiosk users may fit cheaper plans. When someone leaves, converting their mailbox to a shared mailbox is covered in the offboarding checklist.
- Backup isn't in either plan's price: Microsoft 365 Backup is billed separately, pay-as-you-go through an Azure subscription. See Does a small business need Microsoft 365 backup?
- Turn on what you paid for: the most common waste I see is a tenant paying for Business Premium while still running only security defaults and unmanaged PCs. Start with the Intune setup guide and the Conditional Access starter policies. If you're not sure whether to keep security defaults, read Security defaults vs Conditional Access first.
Sources
- Microsoft 365 pricing and packaging updates (Microsoft Licensing)
- Microsoft 365 Business Premium FAQ (Microsoft Learn)
- What is Microsoft Defender for Business? (Microsoft Learn)
- Defender for Office 365 service description (Microsoft Learn)
- Exchange Online limits (Microsoft Learn)
- Windows Autopatch prerequisites (Microsoft Learn)
- Hotpatch updates (Microsoft Learn)
- Microsoft 365 Business Premium plan page (Microsoft)
- Subscription suites licensing guidance (Microsoft Licensing)
- Microsoft Purview service description (Microsoft Learn)
- Windows commercial licensing overview (Microsoft Learn)
- Credential Guard overview (Microsoft Learn)
- Overview of shared computer activation (Microsoft Learn)
- Overview of Cloud Policy service (Microsoft Learn)
- Windows 11 release information (Microsoft Learn)
Where to buy: directly from Microsoft on the Business Premium plan page, or through a Microsoft partner (Microsoft's Business Premium FAQ lists both options). These are ordinary links, not affiliate links.