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, but many environments do not have all relevant controls configured or consistently enforced. 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.

Many foundational controls are available within commonly used Microsoft 365 plans, but feature availability varies by licence, tenant configuration and workload. Capabilities such as Privileged Identity Management, advanced Defender functions, automated labelling and some Purview controls may require additional licensing. Confirm entitlements before implementation. The checklist orders the steps by impact so you can address the high-value items first and evidence the change in your Secure Score.