Securing a Microsoft 365 Tenant

When securing a Microsoft 365 tenant, I started by hardening identity and access, since account compromise is the most common attack vector. I enforced multi-factor authentication across all users, disabled legacy authentication, and implemented Conditional Access policies to control sign-ins based on user role, device compliance, and risk level. These controls established a secure baseline while minimizing disruption to normal workflows.

I then configured tenant security settings and endpoint protections to provide ongoing visibility and defense. This included reviewing sign-in logs, tightening default security configurations, and ensuring endpoints were protected and properly managed. By combining identity hardening with endpoint security and continuous monitoring, I was able to significantly reduce exposure to phishing, unauthorized access, and misconfiguration risks while maintaining a manageable and scalable environment.