Microsoft 365 Business Premium vs. E3 vs. E5: Which License Is Right for Your Business?

One thing about Microsoft 365 that confuses a lot of businesses is licensing. Most businesses we talk to have a hard time understanding the differences between each plan, especially when the choice is between Microsoft 365 Business Premium, E3, and E5. That’s not unreasonable. Business Premium, E3, and E5 are each packed with overlapping productivity, security, and compliance tools, and the differences between them aren’t always clear. So, what often happens is that a business either under-licenses and ends up exposed from a security standpoint or adding on third-party tools to fill the gaps, or they over-license and drive up their monthly bill for features nobody uses.

Ultimately, the right license comes down to your business’ size, compliance needs, and user personas. And you don’t have to put everyone on the same license. A mixed-licensing approach – higher tiers for high-risk users, lighter plans for everyone else – is often the most cost-effective strategy.

Below, we compare Business Premium vs E3 vs E5 across features, cost, and ideal use case, plus how to decide which one fits your business.

• Microsoft 365 Business Premium vs E3
• Microsoft 365 E3 vs E5
• Microsoft 365 Business Premium vs E5
• How to choose the right license?
• FAQ

Microsoft 365 Business Premium vs. E3

If you’re under 300 users, Microsoft 365 Business Premium almost always gives you more security for less money. You move to E3 when you outgrow the 300-seat cap or need enterprise-grade compliance and Windows licensing that Business Premium doesn’t include.

The first thing to know is the seat cap. Microsoft strictly limits Business Premium to 300 seats per tenant. If you don’t expect to cross that line anytime soon, Business Premium offers one of the best values in Microsoft’s entire lineup. It’s roughly $22/user/month versus $39 for E3, and it comes packed with security tools like Microsoft Entra ID P1, Defender for Business, Intune, and Purview. You can even bundle it with Copilot.

And with Microsoft’s July 2026 update, Business Premium’s mailbox storage doubled from 50GB to 100GB per user, which eliminated one of the reasons businesses jumped to an enterprise license.

So, when does E3 make sense? Two situations. First, you’ve passed 300 users. At that point Business Premium isn’t an option and E3 is the entry point into enterprise licensing. Second, you have heavier governance needs like advanced retention, records management, extended eDiscovery, or Windows 11 Enterprise licensing that Business Premium doesn’t cover.

Microsoft 365 E3 vs. E5

Microsoft’s Enterprise plans scale to unrestricted seats, so the choice here depends on how deep your security and compliance needs run. Also, after Microsoft’s July 2026 update, both E3 and E5 licenses got more expensive, but each picked up some new security features.

Here’s what changed: E3 now includes baseline email threat protection like Defender for Office 365 Plan 1 and the same Intune device management tools as E5. So, if you were told years ago that you “need E5 for device management,” that’s no longer true.

Where E5 stands out comes down to three things:

• Investigation, not just prevention: E3 gives you antivirus-grade endpoint protection and can block the obvious threats. E5 adds layers of security across detection, investigation, and response through Defender for Endpoint Plan 2, Defender for Identity, Defender for Cloud Apps, and Defender XDR. All these tools provide your team with the visibility into threats in a central dashboard.
• Identity governance (Entra ID P2): This is the one we flag constantly. In our Microsoft 365 Security Configuration Reviews, we routinely surface gaps like incomplete Conditional Access and MFA coverage, and excessive standing administrative privileges. E5’s Entra ID Plan 2 supports risk-based Conditional Access, Privileged Identity Management, and Access Reviews so admin rights are time-boxed instead of permanent.
• Automated compliance (Purview): Insider Risk Management and Communication Compliance are missing in E3. E5 also upgrades eDiscovery and Audit from Standard to Premium.

E5 also includes Power BI Pro and Teams Phone natively. If you’re already paying for those as separate add-ons across a chunk of your E3 users, the math can tip toward E5 quickly.

For most knowledge-worker teams without a specific regulatory mandate, E3 covers what they need day to day. E5 earns its ~$21/user/month premium when you have a compliance requirement, a security team that needs a unified investigation view, or identity risks that only Entra ID P2 controls can address. And you can always opt for a mixed-licensing approach, using E5 for security, compliance, and sensitive-data roles, and E3 for everyone else.

Microsoft 365 Business Premium vs. E5

This is Microsoft's strongest business plan going head-to-head with its top enterprise plan. Both come loaded with security, but E5 runs nearly triple the cost of Business Premium at $60 vs $22/user/month, so the real question is whether your business or users actually need what E5 adds on top.

Business Premium and E5 share the same baseline security foundation. Both include Intune for device management, Entra ID for identity, and Microsoft Defender protection. For a lot of businesses under 300 users, that baseline offers enough protection and satisfies cyberinsurance requirements.

Where E5 pulls ahead is in detection, investigation, and response capabilities — the same three areas that separate E3 from E5:

• Advanced threat protection: E5 steps up to Defender for Endpoint Plan 2, Defender for Identity, Defender for Cloud Apps, and the unified Defender XDR view — versus the prevention-focused Defender for Business in Premium.
• Identity governance (Entra ID P2): Risk-based Conditional Access, Privileged Identity Management, and Access Reviews.
• Automated compliance (Purview): Insider Risk Management, Communication Compliance, and eDiscovery Premium, none of which exist in Business Premium's basic compliance tier.

E5 also bundles Power BI Pro and Teams Phone natively, which Business Premium doesn't include.

If your business has under 300 users, Business Premium is the right call because you get strong security without paying enterprise prices. E5 makes sense when compliance mandates, sensitive data, or identity-risk gaps demand tooling that Business Premium doesn’t provide. And again, running Business Premium for most staff and providing E5 to your highest-risk users is fully supported and usually the right move to save money.

Microsoft 365 Business Premium vs. E3 vs. E5 comparison chart

Key takeaways: How to choose the right license for your business?

Ultimately, choosing between Microsoft's business and enterprise plans is about picking the license or mix of licenses that fits your user count, your roles, and your company's compliance and governance needs. For a lot of the companies we talk to, especially small to medium-sized businesses, Microsoft 365 Business Premium is the best value because it delivers strong baseline security with Defender for Office 365 P1 and Intune, covering essential email and device protection without enterprise pricing.

Most businesses only move into enterprise territory when they cross 300 seats or need more advanced threat and identity protection for compliance or regulatory reasons. E3 and E5 are now nearly identical on device management and, since the July 2026 update, on foundational email security with Defender for Office 365 P1. The decision to step up to E5 really comes down to whether you need its investigation-grade tools like Defender XDR, Entra ID P2, and advanced Purview compliance features.

One thing to note is that you don't always have to jump a full tier to close a gap. Microsoft lets you add standalone capabilities to a lower plan. For example, adding Teams Phone, Power BI Pro, or Entra P2 license to E3 rather than upgrading everyone to E5. However, once you're adding two or three add-ons across a large number of your users, E5 often becomes cheaper. Add-ons make the most sense when only a handful of users need one specific capability; a full E5 upgrade or mixed licensing usually wins once the need extends beyond a handful of users.

To wrap up, here is a high-level comparison of Business Premium, E3, and E5: 

• Business Premium is capped at 300 seats per tenant and punches above its price. At $22/user/month billed annually, it includes Intune, Entra ID P1, and Defender for office 365 P1. This is often enough baseline security for most SMBs, and now comes with a 100GB mailbox after the July 2026 update.
• E3 is about scale and governance. It removes the seat cap and adds Windows 11 Enterprise and advanced records management. But it does not include the advanced Defender or Entra ID P2 tier.
• E5 earns its premium through depth. It’s worth the price jump when you need investigation-grade security, automated compliance, or you’re replacing third-party tools, or Power BI Pro.
• Mixed licensing is usually the most cost-effective strategy. You can run Business Premium or E3 for most staff and layer E5 onto high-risk roles. This approach is fully supported in one tenant.

Microsoft 365 Business Premium vs. E3 vs. E5 FAQ