Microsoft Defender for Office 365 (Plan 1)
Part of Defender for Office 365 — Plan 1
Defender for Office 365 Included in 41 licenses
Microsoft 365 Business Premium Business Standard plus a slice of enterprise security — Intune device management, Entra ID P1, and Defender for Business — for small businesses that need managed devices; capped at 300 seats.
Microsoft 365
Microsoft 365 E3 Office 365 E3's productivity core plus Windows, Intune device management, and Entra ID — the standard Microsoft 365 Enterprise plan; no seat cap.
Microsoft 365 E5 Microsoft 365 E3 plus the full Defender security suite, Purview compliance stack, and advanced analytics — the top Microsoft 365 Enterprise tier; no seat cap.
Microsoft 365 E7 Microsoft 365 E5 plus additional advanced security add-ons bundled into a single SKU — Microsoft's newest, highest Enterprise tier.
Office 365
Office 365 E3 Adds desktop Office apps and a fuller Exchange/SharePoint/compliance feature set to E1 — the standard mid-tier Enterprise productivity plan; no seat cap.
Office 365 E5 Office 365 E3 plus advanced security, compliance, and voice (Teams Phone, Audio Conferencing) — the top Office-only Enterprise tier; no seat cap.
Microsoft Defender for Office 365 (Plan 1) Anti-phishing, safe links, and safe attachments for email and Office documents — the entry Defender for Office 365 tier.
Microsoft Defender for Office 365 (Plan 2) Defender for Office 365 P1 plus threat hunting, automated investigation and response, and attack simulation training.