An enterprise bundle from Microsoft. Since 1 July 2026, Defender for Office 365 Plan 1 has come with it, alongside Microsoft Entra ID P1 and the core of Microsoft Purview.
Also called Microsoft 365 E3.
Read more: Microsoft Learn
In the Ultra Transcenders books
SC-900AB-900SC-200SC-300DP-600SC-401MD-102
Each book explains E3 in context, with comparison tables and the common traps.
Terms in this definition
- Enterprise
Any group of organisations with shared goals. Examples range from an entire company or one of its divisions to a government department, or several organisations working as partners or along a supply chain.
- Defender for Office 365 Plan 1
The entry tier of Defender for Office 365. Safe Links, Safe Attachments and impersonation protection guard mail and collaboration tools against phishing, business email compromise and zero-day malware. Bundled with Microsoft 365 Business Premium, and from 1 July 2026 with Office 365 E3 and Microsoft 365 E3 too.
- Microsoft Entra ID P1
Premium tier of Microsoft Entra ID, bundled with Microsoft 365 Business Premium, that unlocks capabilities like Conditional Access.
- Microsoft Purview
Family of Microsoft products for data governance, security and compliance. Its Data Map stores only metadata, such as lineage, schema and classification, never the data itself.
Related terms
- Defender for Endpoint Plan 1
Bundled with Microsoft 365 E3, the entry-level Defender for Endpoint tier offers protection features (next-generation antivirus and attack surface reduction), central management and manual response, while EDR, advanced hunting and automated investigation are all missing from it.
- Microsoft Intune Plan 2
Adds advanced features on top of Plan 1, for instance Advanced Analytics, Remote Help, Tunnel for MAM, FOTA and management of specialty devices. Microsoft 365 E3 has included them since July 2026.