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Microsoft 365 has become the backbone of SMB operations, powering email, authentication, collaboration, and business continuity for more than 345 million paid users worldwide (Microsoft Security Blog, 2024). Its ubiquity also makes it a prime target, eg., nearly 90 percent of cyberattacks begin with email or identity compromise, and a single tenant breach can expose sensitive communications, financial data, intellectual property, and administrative controls. Yet most Microsoft 365 environments remain dangerously under-secured. Default settings often persist, and misconfigurations such as legacy authentication or missing MFA on admin accounts create hidden exposures that attackers exploit with ease. Managed Service Providers (MSPs) face a scaling challenge: existing frameworks like CIS Controls lack specificity, while Microsoft Secure Score blends licensing priorities with security guidance. Auditing tenants manually is slow, inconsistent, and nearly impossible to sustain across dozens or hundreds of clients. To address this gap, the U.S. Cybersecurity and Infrastructure Security Agency (CISA) introduced ScubaGear, a defensible, threat-informed baseline for Microsoft 365 now required across U.S. government agencies. ScubaGear offers specific configuration checks, binary pass/fail results, and clear scoring—but running it manually doesn’t scale. This white paper explores why Microsoft 365 is such a high-value target, the most common misconfigurations, and why existing approaches fall short. Most importantly, it shows how ThreatMate automates the ScubaGear baseline, enabling MSPs to deliver scalable, profitable, and defensible Microsoft 365 security services.