The most expensive Microsoft 365 license is not the one with the highest per-user price.
It is the one where add-ons fill gaps that a different plan already covers, security features go unconfigured because no one realized they were included, and renewal pricing increases for capabilities the environment never used. Business Premium, E3, and E5 overlap more than most organizations expect. The right choice depends on what your environment needs, not what looks best on a comparison table.
Microsoft has narrowed the gap between these plans significantly over the past two years. Business Premium now includes security and management tools that used to require enterprise licensing. E3 is gaining capabilities that previously required separate add-ons. And E5 remains the most feature-dense option, but many organizations pay for bundled services they never configure.
Microsoft's 2026 packaging updates shifted what each plan includes, what each plan costs, and how add-ons factor into the gap between them. Evaluating the right fit requires looking at those changes alongside what the environment uses today.
Before comparing plans, this distinction needs to be clear. Office 365 E3 and Microsoft 365 E3 are not the same product and confusing them is one of the most common licensing mistakes.
Office 365 E3 is a productivity suite. It includes the full Office desktop apps, Exchange Online Plan 2 with a 100 GB mailbox, SharePoint, OneDrive, and Teams. It does not include Intune, Entra ID P1, Defender for Endpoint, or Windows licensing. As of July 2026, Office 365 E3 moves from $23 to $26 per user per month.
Microsoft 365 E3 bundles Office 365 E3 with Enterprise Mobility + Security E3 and Windows 11 Enterprise. That means it adds:
Microsoft 365 E3 moves from $36 to $39 per user per month after July 1, 2026.
As of July 1, 2026, both Office 365 E3 and Microsoft 365 E3 now include Defender for Office 365 Plan 1.
If your organization is on Office 365 E3 and assumes it includes device management or endpoint protection, those capabilities are not part of the license. That gap often surfaces during a security review or incident rather than during procurement.
This is the most common licensing question for organizations in the SMB space. Microsoft 365 E3 and Microsoft 365 Business Premium overlap heavily, and the decision comes down to scale, compliance depth, and infrastructure requirements rather than basic security.
Both Business Premium and Microsoft 365 E3 include Entra ID P1, Intune, Defender for Office 365 Plan 1, and full Office desktop apps. The core productivity and baseline security experience is similar.
Where E3 pulls ahead:
No user cap. E3 has no 300-user limit, making it the required path for growing organizations.
Windows 11 Enterprise. E3 includes enterprise Windows licensing with advanced deployment controls and Windows Update for Business. Business Premium includes Windows 11 Business.
Defender for Endpoint Plan 1. E3 includes Defender for Endpoint P1, while Business Premium includes Defender for Business. Both are EDR solutions, but they are not the same product. Defender for Business is built for simplified management in smaller environments. Defender for Endpoint P1 provides deeper integration with the broader Microsoft Defender XDR platform. Mixing them in the same tenant can create policy conflicts and compliance gaps.
Server CAL entitlements. E3 includes on-premises server CALs for organizations with hybrid infrastructure.
Broader compliance tools. E3 provides more granular retention, archiving, and data lifecycle management capabilities.
Intune Plan 2, Remote Help, and Advanced Analytics. These are being added to E3 as part of the July 2026 packaging update. Organizations currently licensing any of these separately should audit whether those costs can be removed at renewal.
Where Business Premium holds its own:
Small Business Pricing. For businesses with less than 300 seats, Microsoft 365 Business Premium includes most of the capabilities of Microsoft 365 E3 for a significantly lower price for the small business market.
Price. Business Premium has no price increase in July 2026. E3 does. That gap widens the value difference for organizations that do not need what E3 adds.
100 GB mailboxes. Microsoft is increasing Business plan mailboxes from 50 GB to 100 GB as part of the 2026 rollout, with full availability by August 1, 2026. This removes the mailbox storage gap that was one of the most common reasons organizations moved to E3.
Security baseline. For environments that do not require enterprise-scale management, Business Premium covers identity protection, device management, endpoint security, and email protection without additional licensing.
Add-on flexibility. Business Premium supports optional Defender Suite and Purview Suite add-ons that close most of the gap to E5 without requiring enterprise licensing.
Where security fundamentals are the priority and hybrid on-premises infrastructure is not a factor, Business Premium often delivers more value per dollar than E3.
The gap between Business Premium and E5 is real, but it is not always a reason to upgrade every user. The question is whether the specific capabilities in E5 are required across your environment or whether targeted add-ons on Business Premium can address the actual gaps.
Business Premium covers identity protection, device management, endpoint security, and email security. E5 adds advanced threat detection, identity governance, compliance automation, analytics, and voice.
Where E5 adds capabilities Business Premium does not include natively:
For many small businesses, adding Defender Suite and Purview Suite add-ons to Business Premium is a combination of capabilities that provide small businesses with the most crucial capabilities of E5 for a fraction of the price.
For organizations that need deeper security and data governance but do not need Power BI Pro, Teams Phone, or the full E5 analytics stack, Microsoft offers add-on suites for Business Premium:
Business Premium at $22 plus the combined suite at $15 brings the total to $37 per user per month. The threshold for moving to E5 comes down to how many of the capabilities outside the Defender and Purview suites are actually needed. If the environment requires Power BI Pro, Teams Phone, Audio Conferencing, and Security Copilot alongside the security and compliance stack, the add-on path starts to lose its cost advantage.
E3 provides the enterprise productivity and security baseline. E5 adds the advanced security operations, compliance automation, analytics, and communication capabilities on top of it.
The most significant differences:
The per-user cost gap between E3 and E5 is outlined in the pricing table below. That gap covers a significant amount of functionality, but only if the environment is configured to use it. Organizations that deploy E5 and only use the E3 features are paying a premium for capabilities that sit idle.
Most Microsoft 365 plans are seeing a price increase at renewal on or after July 1, 2026. The increases vary by plan and align with the security, storage, and management features being added to each tier.
|
Plan |
Previous Price |
New Price (July 2026) |
|---|---|---|
|
Microsoft 365 Business Premium |
$22 |
$22 (no change) |
|
Microsoft 365 E3 |
$36 |
$39 |
|
Office 365 E3 |
$23 |
$26 |
|
Microsoft 365 E5 |
$57 |
$60 |
|
Business Basic |
$6 |
$7 |
|
Business Standard |
$12.50 |
$14 |
Business Premium holding at $22 while gaining 100 GB mailboxes makes it a particularly strong value heading into renewal.
Start with what your environment actually uses today, not what a feature comparison table says is available.
If the environment is under 300 users and the primary focus is identity protection, endpoint security, device management, and email protection, Business Premium covers the baseline. If advanced security or compliance gaps exist, the Defender and Purview add-on suites provide a clear upgrade path without jumping to enterprise licensing.
If the organization has outgrown 300 users, requires hybrid on-premises infrastructure support, or needs enterprise Windows licensing, Microsoft 365 E3 is the more practical foundation.
If security operations consolidation, advanced compliance automation, Power BI, and voice are all part of the strategy, E5 delivers the most complete package under a single license.
The right license is the one that aligns with how the platform is deployed and managed, not the one with the longest feature list.
Microsoft's 2026 packaging updates add real value to Business Premium and E3, but they also change what you are paying for at renewal. Taking the time to audit your current add-ons, review your mailbox needs, and understand what your plan now includes can prevent unnecessary spend. It also ensures your environment is getting the full benefit of what is already licensed.
If you want help reviewing your licensing before renewal, the Sourcepass Center of Excellence for Microsoft works through these decisions every day and evaluates options based on your actual environment.