Microsoft 365 Data Security Check

Some of the most overlooked risks include over-permissive sharing, ungoverned personal OneDrives, unclassified sensitive data, and insider misuse. Many organizations also underestimate the impact of shadow data—files that exist outside of known retention or access policies. Without visibility into these risks, it's difficult to enforce compliance, detect threats, or respond to incidents. Microsoft Purview’s data protection tools, combined with expert-led analysis, can help you surface and address these blind spots.

Many organizations struggle to monitor how sensitive data is shared, accessed, or stored across Microsoft 365. Files containing financial records, customer data, or intellectual property can end up in personal OneDrives, unprotected SharePoint folders, or shared externally without proper controls. Microsoft Purview provides tools to classify and surface this information, but uncovering exposure often requires a centralized view across workloads. A structured data security assessment can help you identify high-risk areas and prioritize remediation efforts.

Start by discovering where your sensitive data resides. Lighthouse uses it proprietary Enterprise Scan to provide this service. Then, prioritize risks and deploy appropriate policies such as DLP, sensitivity labels, and insider risk rules. Many organizations benefit from a structured assessment to guide this process.

Microsoft 365 includes tools like Microsoft Purview Data Loss Prevention (DLP), sensitivity labels, and Insider Risk Management. These features help monitor, classify, and restrict the sharing of sensitive data across email, cloud storage, and collaboration platforms.

Sensitivity labels apply persistent protection—such as encryption and access restrictions—to files and emails. DLP policies, on the other hand, monitor and block risky actions (like sharing or transferring sensitive data) based on policy rules. They work best when used together.