10 Microsoft 365 security quick wins

A practical checklist of the highest-leverage Microsoft 365 hardening steps — most can be applied this week to lift your Secure Score and close common gaps.

Microsoft 365 ships with strong security controls — most just aren't switched on by default. These are the highest-leverage hardening steps for a mid-market tenant: each one closes a common attack path and lifts your Microsoft Secure Score. The full, ordered checklist is the download below; here's what it covers and why it matters.

Where the quick wins are

• Identity: enforce MFA for everyone, block legacy authentication, and use Conditional Access for risky sign-ins.
• Admin: cut the number of Global Admins, use role-based administration and Privileged Identity Management.
• Email: tune anti-phishing, Safe Links and Safe Attachments, and add external-sender warnings.
• Data: turn on sensitivity labels and basic DLP for the information that actually matters.
• Visibility: enable unified audit logging and review Secure Score monthly.

For most Business Premium or E3/E5 tenants none of these need new licences — they're configuration, not procurement. The checklist orders them by impact so you can knock off the high-value items first and evidence the change in your Secure Score.