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Microsoft 365 Security Architecture

Master Microsoft 365 Security Architecture

Design, justify, implement, and defend a comprehensive Zero Trust security architecture for Microsoft 365 that protects every user, device, app, and data; across Entra ID, Defender XDR, Purview, Intune, and hybrid environments. Turn complex M365 security controls into a resilient, measurable security posture that executives understand and attackers cannot bypass.

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View Pricing Take End of Course Exam → 40 CPE Credits

What you'll be able to do

✓Design and implement a comprehensive Zero Trust security architecture across the full Microsoft 365 ecosystem
✓Deploy and optimise Microsoft Defender XDR, Entra ID Conditional Access, Intune, Purview, and Microsoft Sentinel for integrated protection
✓Justify security architecture decisions with clear risk metrics, executive presentations, and business-aligned documentation
✓Configure secure identity, endpoint, application, data, and compliance controls that work seamlessly in hybrid environments
✓Proactively hunt, detect, and respond to advanced threats targeting Microsoft 365
✓Continuously assess, measure, and improve your organisation's overall M365 security posture
ARC501 | Specialist tier | 15 modules across 4 phases | 36–40 hours at your own pace | 40 CPE credits | 5 free preview lessons - no account needed | Updated June 2026
Course Agenda View all 15 modules

Course overview

The Microsoft 365 Security Architecture course is built specifically for Security Architects, Engineers, and Administrators who design, justify, implement, and defend M365 security posture. You'll gain hands-on expertise to:

✓ Architect and implement a complete Zero Trust security framework across the entire Microsoft 365 stack
✓ Deploy and optimise Microsoft Defender XDR, Entra ID Conditional Access, Intune, Purview, and Microsoft Sentinel for maximum protection
✓ Justify security investments with clear risk reduction metrics and executive-ready documentation
✓ Design secure configurations for identities, endpoints, applications, data, and compliance controls

By the end, you'll have the strategic and technical mastery to own your organisation's Microsoft 365 security architecture, confidently defending it against modern threats while aligning security outcomes with business goals.

Who this course is for

You're a Security Architect, Security Engineer, or Microsoft 365 Administrator responsible for designing, justifying, implementing, and defending your organisation's Microsoft 365 security posture. This course is built for you if you want to:

✓ Move from tactical configuration to strategic, enterprise-grade security architecture
✓ Master the integration of Defender XDR, Entra ID, Intune, Purview, and Sentinel into a cohesive Zero Trust model
✓ Gain the confidence to justify security investments and defend your architecture to executives and auditors
✓ Build resilient controls that protect identities, endpoints, applications, and sensitive data at scale

In short: if you're ready to own and defend a modern Microsoft 365 security architecture that actually works against today's threats, this course is for you.

What you'll learn

By the end of this Microsoft 365 Security Architecture course you will be able to:

✓ Architect and implement a complete Zero Trust security framework across Microsoft 365 and hybrid environments
✓ Design and optimise Conditional Access policies, Privileged Identity Management, and device compliance strategies
✓ Deploy and tune Microsoft Defender XDR, Defender for Cloud Apps, and Microsoft Sentinel for unified threat detection and response
✓ Implement data loss prevention (DLP), information protection, and Purview compliance solutions
✓ Secure identities, endpoints, applications, and data with integrated Microsoft security controls
✓ Measure, report, and continuously improve your M365 security posture with meaningful metrics

Key course takeaways

✓ Build and defend a production-grade Zero Trust Microsoft 365 security architecture organisations can rely on
✓ Integrate Microsoft Defender XDR, Entra ID, Intune, Purview, and Sentinel into a cohesive, layered defence
✓ Confidently justify and present security architecture decisions to technical and executive stakeholders
✓ Proactively reduce risk by eliminating common attack paths targeting identities, endpoints, and data
✓ Operationalise automated security controls, compliance workflows, and continuous posture improvement
✓ Become the go-to Microsoft 365 Security Architect who transforms security from a cost centre into a strategic business enabler

Things you need to know

What are the prerequisites for this course?

There are no prerequisites. The course teaches M365 security architecture from first principles. Familiarity with the Microsoft 365 admin center and Entra ID will help you move faster through the early modules, but neither is required. Every concept is explained at first use.

What are the device requirements?

A device with a modern browser. Access to a Microsoft 365 E5 developer tenant (free from Microsoft) and an Azure subscription for Sentinel workspace deployment. The course walks you through tenant and workspace setup in Module 0.

How will the course benefit your career?

Security architecture is one of the most in-demand disciplines in cybersecurity. Organisations need people who can design integrated security systems across the M365 stack, not just configure individual products. This course gives you the skills to architect Zero Trust infrastructure, document decisions with ADRs, and present security investments to executives.

The demand for security architects who can bridge technical implementation and business justification continues to grow as organisations move from product-by-product configuration to integrated security architecture.

Usage rights and disclaimer

Course materials: Licensed for individual professional development. You may deploy configurations, detection rules, scripts, and policies in your production environment. You may not redistribute course content or share account credentials.

Architecture configurations: All PowerShell commands, Graph API queries, Conditional Access policies, PIM configurations, and Purview policies are provided as-is. Test every configuration in report-only or simulation mode before enforcement. Ridgeline Cyber Defence is not responsible for operational impact from deployed configurations.

Fictional environment: All scenarios use Northgate Engineering. Any resemblance to real organizations is coincidental.

Version and changelog

Current version: 1.0  |  Last updated: June 2026

June 2026, v1.0: Course page restructured. 15 modules across 4 layers. Complete M365 security architecture from identity foundations through detection, XDR operations, and capstone assembly. 30+ ADRs, decision matrices, risk register, executive summary.

This course is actively maintained. Architecture patterns are updated as Microsoft capabilities evolve.

COURSE ASSESSMENT

End of Course Exam

Complete the course, then prove your skills under time pressure. Pass mark: 70. Earn your certificate with CPE credits.

40minutes
3phases
100points
1scenario
Take End of Course Exam

Requires 80% course completion. One random scenario per attempt. Certificate issued on pass.