Cloud & infrastructure

Securing a Microsoft 365 / Azure migration

A move to Microsoft 365 or Azure changes the security perimeter: identity becomes the new boundary. Here is how we secure the tenant, from access control through to monitoring.

The challenge

In the cloud, identity is the new perimeter

Moving to Microsoft 365 / Azure does not remove your security responsibilities: under the shared responsibility model, tenant configuration, identity management and data protection remain yours. A tenant deployed with defaults often leaves blind spots (partial MFA, no conditional access, over-broad sharing).

Identity becomes the main attack vector: account compromise, phishing, stolen tokens. Security therefore rests first on Entra ID (MFA, conditional access), then on protecting email and endpoints (the Defender suite), hardening aligned with CIS baselines and monitoring capable of detecting abuse.

Our role: secure the migration and the tenant end to end — configuration review, solution integration and monitoring — so you gain from the cloud without inheriting its risks.

What is at stake

Partial MFA and conditional access absent or permissive
Privileged accounts insufficiently protected
Over-broad sharing and permissions (exposed data)
Default configuration, gaps against CIS baselines
Lack of visibility and detection on the tenant

Diagram

Hardening the tenant in depth

Defence in depth: from identity (Entra ID) through to monitoring (Sentinel/SOC), by way of hardening aligned with the CIS Benchmark.

Our approach

How we proceed

Security in layers, from identity control through to detection, matched to your migration path.

Tenant & identity review

Analysis of the Microsoft 365 / Azure and Entra ID configuration: MFA, conditional access, privileged accounts, exposure and sharing. The priority gaps are identified.

CIS Benchmark hardening

Alignment of the configuration with CIS baselines: hardening identity, email, sharing and services, prioritised by risk.

Defender suite integration

Deployment and configuration of Microsoft Defender (Office 365, Endpoint) to protect email, data and endpoints, consistently with how you work.

Migration support

Securing the migration steps (identity, data, endpoints) to avoid importing weaknesses and to maintain service continuity.

Monitoring (Sentinel / SOC)

Detection on the tenant through Microsoft Sentinel and our managed SOC (SOC-E / SOC-X), to spot identity compromise and abnormal behaviour.

Services involved

Several disciplines, a single point of contact

Configuration review, integration and monitoring come from our cybersecurity solutions practice and our SOC — assembled around your migration.

Cybersecurity solutions SOC Penetration testing Audit & Advisory GRC

Deliverables

Tenant and identity review report
Hardening plan aligned with the CIS Benchmark
Defender suite deployed and configured
Hardened Entra ID configuration (MFA, conditional access)
Working Sentinel/SOC monitoring

Frequently asked questions

Microsoft secures the infrastructure, but under the shared responsibility model the tenant configuration, the identities and the data remain your responsibility. A default deployment often leaves blind spots that need correcting.

The CIS Benchmark provides a set of proven hardening recommendations for Microsoft 365 and Azure. It gives an objective basis for measuring gaps and prioritising configuration fixes.

Because in the cloud, identity is the attackers' main way in. MFA, conditional access and protection of privileged accounts are the measures that reduce the risk of compromise the most.

Yes. We work before, during or after the migration: review of what exists, correction of the gaps and setting up monitoring, without necessarily starting over.

A Microsoft 365 / Azure migration to secure?

Let's talk about your cloud path: we secure the tenant without slowing your migration.