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Zero Trust Implementation Guide
A phased implementation guide for adopting Zero Trust principles across a Microsoft 365 environment.
Purpose
This guide sequences Zero Trust adoption across Microsoft 365, following the same build order as Zero Trust in Microsoft 365.
Phase 1 — Verify Explicitly
- MFA enforced for all users.
- Conditional Access evaluating device and risk, not just credentials.
- Phishing-resistant MFA for administrative accounts.
Phase 2 — Least-Privilege Access
- Administrative access moved to just-in-time activation (PIM).
- Periodic access reviews scheduled.
Phase 3 — Assume Breach
- Entra ID Protection risk-based policies enabled.
- Defender threat detection enabled and actively monitored.
- Session controls limiting blast radius for sensitive applications.
Related Resources
- Zero Trust Readiness Assessment — /tools/zero-trust-readiness-assessment