Microsoft 365 E3 vs. E5 vs. E7: Which Suite Does Your Business Need? 

Compare Microsoft E3 vs. E5 vs. E7 

In short: E3 is the foundation, E5 is the security and compliance upgrade, and E7 is E5 plus AI and agent governance. 

Here’s what that looks like in detail 

Comparison table: Microsoft E3 vs. E5 vs. E7 

The simplest way to think about the progression is as follows:  

• Moving from E3 to E5 adds advanced security and compliance.  

• Moving from E5 to E7 adds Microsoft 365 Copilot, Microsoft Agent 365, and Microsoft Entra Suite. 

Microsoft 365 E3 vs. E5: What the upgrade offers 

When we talk security with a customer, we often ask where they stand on the E3 to E5 plateau. It’s never a surprise question. Some already have E5 for every employee, which is a wise move. Others are just starting the journey. Here is the short version of what changes when you move from E3 to E5: 

Source: Microsoft Learn, Compare Microsoft Copilot in Microsoft 365 E3, E5, and E7. 

For larger organizations, we encourage customers to weigh both the security and the financial case for E5. Bundled pricing for these capabilities is usually more attractive than assembling them piece by piece, and they work together out of the box. E5 is also gaining value: Microsoft’s new integrated security operations center (ISOC) experience brings basic SIEM capabilities inside Defender, with lower data ingestion costs, for eligible customers that don’t use Microsoft Sentinel. For some organizations, that alone can change the math on an E5 upgrade. 

Microsoft offers Microsoft 365 E3 customers an affordable way to achieve security parity with E5 through the Microsoft Defender Suite add-on. Adding Defender Suite to E3 brings the same core threat protection found in E5: Defender for Endpoint Plan 2, Defender for Office 365 Plan 2, Defender for Identity, Defender for Cloud Apps, and Entra ID P2. What it does not bring is the rest of E5, including advanced Purview compliance and Security Copilot inclusion. E3 plus Defender Suite is a great fit for E3 customers that don’t need E5’s non-security features but still want E5-level protection across their users, devices, email, and identities. 

Business Premium vs. E3 vs. E5: The path for organizations under 300 users 

For organizations under 300 users, Microsoft offers Microsoft 365 Business Premium, the modern descendant of the old Small Business Server that put email, directory, and file services on one box. We typically steer smaller customers to Business Premium specifically, not Business Basic or Standard, because Premium is where the security features live. 

Out of the box, Business Premium is roughly analogous to E3 for security. Add the Microsoft Defender Suite for Business Premium, and you get the E5-class protections that a small shop needs. 

Source: Microsoft Learn, Add Microsoft Defender Suite for Business Premium. 

Why Defender for Identity matters, even in the cloud 

Almost everybody still has Active Directory. Even if your domain controllers live in the cloud, it’s still Active Directory, with its own security database independent of your cloud identities. Whether you use Entra ID or another identity provider, you still need to watch what happens at the domain authentication level. There are some Active Directory-specific threats such as Kerberoasting and Golden Ticket attacks that can only be detected by deep inspection of Active Directory internals.  

That’s the job of Defender for Identity. Say it flags a potentially compromised account. The next question is what that account has done. Defender for Endpoint tracks activity on devices by identity, so Defender XDR can correlate the two and show you a compromised Active Directory account copying files off a file server it has no business touching. With E5, E3 plus the Defender Suite, or Business Premium plus the Defender Suite, you have coverage across identity, endpoint, email, and cloud apps, with the signals correlated in one place. No excuses. 

What Microsoft 365 E7 adds: Copilot, Agent 365 and Entra Suite 

Microsoft 365 E7, which Microsoft calls the Frontier Suite, became generally available on May 1, 2026. It includes everything in E5 and adds three things: Microsoft 365 Copilot, Microsoft Agent 365, and the Microsoft Entra Suite. 

As a Microsoft MVP, I speak at tech conferences, and I always ask for a show of hands: who’s on E3, E5, E7? Even though E7 is new, every room I’ve spoken to has had several people raise their hand for E7. Given how slowly the earlier suites caught on, this surprises me. The reason, I think, is that customers see they need to extend AI to their employees to stay competitive, and they need a way to control it. 

Why agent governance can’t wait 

Agent 365 offers management, monitoring, governance, and security for AI agents. Microsoft didn’t put “Defender” in the name, but it’s really another member of the Defender family. And it isn’t limited to Microsoft’s agents: it also governs how third-party agents interact with your Microsoft environment, your data, and your users. Be clear about the limit, though. Agent 365 governs an agent’s access, permissions, and data handling, not the actual operation of the agent. 

Some leaders take the ostrich approach: no agents over my dead body, so no need for agent governance. But shadow IT is real, and so are shadow AI agents. Above a certain size, I’d bet money your organization already has agents running. Agents save people time, reduce stress, and get them home earlier. If you don’t help users adopt them, they’ll deploy them anyway. 

The answer isn’t to shut them all down. That’s draconian, and your sales team may have found an agent that’s bringing in deals. A good leader sees that lightbulb go on. The goal is control and confidence: knowing which agents exist, who deployed them, and what they can touch, so you can state that as fact to your executives and stakeholders.  

You can buy Agent 365 standalone, but the E7 bundle is what’s catching on. I covered this in depth in how Agent 365 in Microsoft 365 E7 will revolutionize enterprise AI governance. 

Why Copilot is part of the bundle 

Microsoft 365 Copilot adoption keeps growing because employees use an AI tool that’s wrapped around the apps they already work in. With Copilot Studio, they’ll start building their own agents. That’s exactly why Copilot and Agent 365 belong together. 

Concerns about AI are legitimate, but organizations are addressing them with proper data preparation, governance, and training. You might be surprised at how little training is needed for Copilot to boost a user’s productivity. Give employees the AI capability and give yourself the ability to verify what they’re doing with it. Just know that governance isn’t free: Agent 365 creates more work for your security team, not less, so decide who will own it before you scale. 

For businesses that get it, E7 is close to a no-brainer. Check the Microsoft Copilot requirements and the ROI case for Copilot before you roll it out. 

Microsoft 365 vs. Office 365: Why the difference matters 

It’s important to understand the distinction between Microsoft 365 and Office 365. The names get used interchangeably, but they shouldn’t be.  

• Office 365 is the productivity applications: Word, Excel, PowerPoint, Outlook and Teams.  

• Microsoft 365 bundles those apps with device management, identity, threat protection and compliance. 

Here’s what that looks like in detail. 

Companies learned the hard way that productivity tools alone aren’t enough. Without management, monitoring, governance, and security, you expose your environment to potential cyber breaches and data loss. That’s why Microsoft created Microsoft 365. For more on locking down the platform, see this article: 12 Microsoft 365 security best practices. 

Why integrated security beats a stack of point products 

The real value of a Microsoft 365 suite isn’t any single tool. It’s the fact that the tools share signals. Here’s a common scenario in which Microsoft 365 applications work together to protect the environment: 

1. A phishing email slips past filtering and lands in a user’s inbox. 
2. Defender for Office 365 later learns the link is dangerous. 
3. The user clicks it. Defender for Endpoint knows the click happened on that device. 
4. Both signals flow into Defender XDR, which correlates them and orchestrates a response to contain the threat. 

You can buy email security from one vendor and endpoint protection from another, but it’s difficult to get two separate products to work together seamlessly, as each has its own detections of the same attack.  

In the Microsoft world, you don’t have those integration worries. Every signal is processed holistically across the relevant applications. That’s also why we built our managed detection and response service on the Microsoft stack. Read more about Microsoft Verified MXDR.  

How to choose the right Microsoft 365 licensing for your organization 

The right choice depends on your size, your AI plans, and the security tools you already own. Here’s how we typically guide customers: 

If a required upgrade isn’t in this year’s budget, or you’re locked into third-party contracts, put it on your roadmap now and plan the transition around renewal dates. Many customers I talk to are already running five or so employees on E7 as a pilot. Government customers should also read our guide to Microsoft 365 Copilot for GCC and GCC High. 

To see the plans side by side, try our Microsoft 365 Licensing Comparison tool. 

Frequently asked questions about Microsoft 365 E3, E5 and E7 

What is the difference between Microsoft 365 E3 and E5? 

Microsoft 365 E5 includes everything in E3 and adds advanced security, compliance, and analytics. E3 customers who mainly want E5’s security can add the Microsoft Defender Suite instead. The biggest security differences are: 

• Entra ID P2 instead of P1 for risk-based identity protection 

• Defender for Endpoint Plan 2 and Defender for Office 365 Plan 2 

• Defender for Identity and Defender for Cloud Apps 

• Advanced Microsoft Purview compliance capabilities 

Is Microsoft 365 Business Premium as secure as E5? 

On its own, Business Premium offers security roughly comparable to E3. Adding the Microsoft Defender Suite for Business Premium brings E5-class security, including Defender for Identity, Defender for Endpoint Plan 2, Defender for Office 365 Plan 2, Entra ID P2 and Defender for Cloud Apps. Business Premium is limited to 300 users. 

What is Microsoft 365 E7? 

Microsoft 365 E7, also called the Frontier Suite, is Microsoft’s top enterprise plan. It became generally available on May 1, 2026, and includes all of Microsoft 365 E5 plus Microsoft 365 Copilot, Microsoft Agent 365 and the Microsoft Entra Suite. 

What is the difference between E5 and E7? 

E7 adds AI and agent governance to E5. Copilot is an add-on with E5 but included in E7, and Agent 365 and the Entra Suite are included only in E7. Agent 365 can also be purchased standalone. 

Do I need Microsoft 365 E7 to govern AI agents? 

No. Microsoft Agent 365 is available as a standalone product. E7 bundles it with Copilot and E5 security, which many organizations find simpler and more cost-effective if they’re deploying Copilot anyway. 

What is the difference between Office 365 E3 and Microsoft 365 E3? 

Office 365 E3 provides Office apps and collaboration services. Microsoft 365 E3 adds Windows Enterprise, Intune device management, Entra ID P1, and Defender for Endpoint Plan 1, making it a security and management platform rather than just a productivity suite. 

The bottom line: Buy the suite Microsoft built to protect itself 

These tools were developed by Microsoft to protect Microsoft. They secure Azure, Microsoft 365, Xbox, and Outlook.com at global scale. When you buy one of these suites, you’re snapping into hyperscale-proven technology for management, monitoring, governance, and security, whatever your business size. 

Not sure which suite fits? Compare plans with our Microsoft 365 Licensing Comparison tool or talk to our Microsoft team about a licensing and security review.