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Tenant security and Defender

Microsoft Defender, DLP, sensitivity labels, external sharing, mail security, governance and the operating habits that turn a licensed tenant into a controlled one.

A drifted Microsoft 365 tenant is the most common starting point for engagements. These notes cover Defender baselines, DLP for Copilot and third-party AI, sensitivity labels, external sharing clean-up, secure score backlog work and the day-to-day operating model.

When to start here

Use this tenant & defender cluster when the issue is bigger than one setting and you need to understand the control family before changing it.

What to collect

Bring tenant size, licences, current owners, recent incidents, audit deadlines and any policy exceptions that nobody can confidently explain.

Next decision

If the notes match your symptoms, move from reading to a scoped review so the risk, owner, evidence and remediation order are written down.

Control questions

These questions turn the tenant & defender notes into a useful review brief before anyone touches policy.

  • Are Defender alerts, exclusions, mail security and endpoint coverage owned day to day?
  • Which SharePoint, OneDrive, Teams and guest-access choices expose sensitive work?
  • Can the tenant produce useful evidence for audit, board reporting or incident response?

Move from reading to action when the tenant has licensed controls but no operating rhythm. Governance needs owners, review cycles and proof.

A typical review checks Defender ownership, mail protection, DLP, labels, sharing settings, audit evidence and response habits so licensed features become controls rather than unused portals.

Notes in this cluster

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