Microsoft 365 E3 defined
Microsoft 365 E3 is an enterprise subscription plan that combines three things into one per user license: the Office productivity apps for desktop, web, and mobile, the core cloud services of Exchange email, Teams, SharePoint, and OneDrive, and a foundational layer of security, identity, and device management. It is built for the everyday knowledge worker, the person who needs full Office, reliable email, and the collaboration tools, with sensible enterprise controls underneath. In most organizations, E3 is the plan the majority of staff sit on.
What E3 includes
The value of E3 is breadth. A single seat covers the work most people do all day, which is exactly why so much of the wider collaboration stack overlaps with what E3 already provides. Teams covers meetings and messaging, SharePoint and OneDrive cover file storage and sharing, and the Office apps cover documents. When a company also pays for separate meeting, chat, or storage tools, it is often paying twice for capability it already owns inside E3. That overlap is the heart of digital workplace cost optimization, where the bundled view exposes the duplication a single vendor specialist never sees.
E3 versus E5
The most common question is how E3 differs from E5. E5 includes everything in E3 and adds advanced security and threat protection, advanced compliance and information governance, analytics, and Teams Phone and audio conferencing capability, all at a meaningfully higher price per user. E3 is the productivity and core management tier. E5 is for users who genuinely need its advanced add ons. The decision between them is one of the largest single levers in a Microsoft estate, and we cover it in depth in our comparison of Microsoft 365 E3 vs E5 cost and our pillar on Microsoft 365 optimization.
Microsoft lists Microsoft 365 E3 at roughly USD 36 per user per month on an annual commitment as of June 2026. The actual price depends on the buying route and any negotiated discount, and list prices change often, so confirm the current figure before you budget against it.
Source: Microsoft published Microsoft 365 enterprise plan pricing, as of June 2026. Plans, inclusions, and prices change often; confirm against Microsoft's current pricing for your region and agreement.
Why E3 matters for cost
The classic Microsoft overspend is licensing everyone on E5 when only a subset of users needs its advanced features. Because a tenant can mix plans, the disciplined approach is to put most users on E3, a smaller group that truly needs advanced security or compliance on E5, and frontline staff on F1 or F3. Matching the plan to the role rather than buying one tier for the whole company is one of the biggest savings in the stack, and it is exactly the kind of right sizing our assessment looks for.
This definition is commercial and cost advisory, not legal advice. For how your specific Microsoft agreement governs plan changes, consult your own counsel.