Microsoft 365 security audit services

Turn tenant settings into an actionable assessment

A Microsoft 365 security audit examines how selected security controls are configured, who they cover and what evidence supports their operation. Atlant Security combines workload review with business context so the output identifies a practical order of action.

The terms Office 365 audit, tenant security assessment and Microsoft 365 health check often overlap. Our proposal states the actual workloads, methods, evidence period and deliverables rather than relying on a label.

Choose the workloads your decision depends on

• Entra ID security audit — Understand identity lifecycle, privileged roles and the paths that connect your people, applications and tenant.
• Conditional Access review — Examine which people, applications and sign-in situations your policies actually cover.
• Exchange Online security audit — Review mail flow, forwarding, authentication and effective protection for the recipients that matter.
• SharePoint, OneDrive & Teams security audit — Trace external sharing and collaboration back to the information, owners and access decisions behind them.
• Intune security audit — Connect device inventory, policy assignment and compliance signals to real access decisions.
• Microsoft 365 Copilot security readiness — Review information access and governance before expanding how employees discover organisational knowledge.
• OAuth app & consent permissions audit — Review the non-human access paths that remain outside a simple user-and-MFA checklist.
• Purview audit & logging review — Establish which questions your current audit evidence can answer, for which users and over what period.

Assess coverage, not just configuration

For each selected area, agree the intended control, the relevant population and the supporting records. Compare policy settings with assignments, exclusions and representative operating evidence. Validate observations with the owner before reporting.

A snapshot and a review of operation over time support different conclusions. Unavailable logs, unlicensed capabilities and excluded workloads remain visible as limitations.

What your team receives

• Executive summary tied to the assessment objectives
• Technical findings with evidence references, affected populations and limitations
• Prioritised action register with owners, dependencies and validation criteria
• A factual review and findings discussion; implementation and revalidation scoped separately

Start with controlled access

We agree evidence access before work begins. Your team can lead supervised sessions and provide approved, minimised exports. The assessment does not require you to send passwords, grant access through this website or permit production changes. See access and data handling.

Prepare your audit request

Use the Microsoft 365 Audit Planner for a licence-aware starting scope, or the detailed scoping assistant. Review the brief and send it with your enquiry. You can attach your NDA or RFP in the contact form.

Prepare a brief before the scoping call

Identify the tenant and licence context, the workloads you use and the decision the audit should support. Keep uncertain coverage and unavailable records visible in the proposed scope.

Use the free microsoft 365 security audit brief builder to record objectives, assessment areas, constraints and NDA preferences. Review the proposed scope, then send it directly to Atlant Security through the contact form.