Many Microsoft 365 environments are left with weak defaults, inconsistent admin controls, and no clear baseline for conditional access or identity protection.
A solid starting point includes MFA enforcement, blocking legacy authentication, reviewing admin roles, enabling Defender where appropriate, and validating mail protections such as SPF, DKIM, and DMARC.
Security in Microsoft 365 is not a one-off checklist. It needs regular review as staff, devices, and business processes change.