IT guide
Microsoft 365 hardening: baseline controls for risk reduction
A working Microsoft 365 tenant is not automatically secure. Hardening focuses on identity, access, email, administrative roles and policies that reduce operational risk.
Areas to review
- MFA for users and administrative accounts.
- Conditional Access aligned with risk and working patterns.
- Separated administrative roles and protected privileged accounts.
- SPF, DKIM, DMARC, antiphishing and Exchange Online Protection policies.
How to apply changes
- Test policies and roll them out gradually where needed.
- Notify users before changes that affect sign-in.
- Document important changes for future administration.
FAQ
Can Microsoft 365 hardening lock users out?
Yes, if it is applied without a plan. Changes should be tested, communicated and introduced gradually based on risk.