Microsoft 365 Security Checklist — 15 Steps to Protection
Why M365 Security is Critical
Microsoft 365 is the heart of most businesses. A compromised account means access to everything.
Steps 1-5: Identity
1. Enable MFA for ALL users. 2. Block legacy auth. 3. Configure Conditional Access. 4. Enable Entra ID Protection. 5. Review admin roles.
Steps 6-10: Data
6. Configure DLP. 7. Enable sensitivity labels. 8. Set retention. 9. Restrict external sharing. 10. Enable audit logging.
Steps 11-15: Protection
11. Safe Links and Safe Attachments. 12. Anti-phishing policies. 13. Defender for Endpoint. 14. DKIM, DMARC, SPF. 15. Secure Score monitoring.