Microsoft 365 Fundamentals — Apps, Identity, Security & Administration

Microsoft 365 Fundamentals: Apps, Identity, Security & Admin

1 min readPublished 22 Jul 2026

Track your progress. Sign in to mark this guide complete and build your Job Readiness Score.

Most organisations run on Microsoft 365 — so supporting it is a core skill for Help Desk, Desktop Support and administration roles, and it feeds Microsoft's MS-900 and SC-900 certifications. This path explains the platform without duplicating identity, which is covered once in Microsoft Entra ID.

Interactive explainer

Microsoft 365 Service Map

How identity, productivity, security and administration fit together.

Tap or hover a part to learn more.

Identity: Entra ID

The foundation.

Microsoft Entra ID (formerly Azure AD) underpins all of Microsoft 365 — every user, licence and access decision flows through it. Learn it once in Windows Fundamentals; it applies everywhere.

Check your understanding

1. What underpins identity across all of Microsoft 365?

2. Which handles data governance and compliance?

Keep learning

Microsoft 365 Fundamentals Microsoft Entra ID CompTIA Security+

Practise this in AI Interview™

What this path covers

Microsoft 365 Apps & Services — Exchange, Teams, SharePoint and OneDrive.
Identity in Microsoft 365 — how it's built on Entra ID.
Security & Compliance — Defender, Purview, MFA and Conditional Access.
Administration — the admin center, licensing and roles.

Shared knowledge, not duplicated

Identity here links to the single authoritative Entra ID article, and security concepts reuse Cloud Security and Security+. Rehearse with AI Interview™ and evidence it in your Career Passport™.

Start with Microsoft 365 Apps & Services.

Interview Intelligence

How this topic actually shows up in interviews — and how to demonstrate you understand it.

Why employers ask about this

Microsoft 365 is the environment most organisations run on, so supporting it is a core early-career IT skill.

Technical questions

What is Microsoft 365 and what does it include?+

An identity-driven cloud platform: Exchange, Teams, SharePoint, OneDrive plus Defender/Purview security.

Behavioural questions

Why do you want to work in a Microsoft 365 environment?+

Tie to its ubiquity and your foundation in identity and cloud concepts.

Real-world scenarios

“You're supporting an organisation fully on Microsoft 365.”+

Expected answer: Orient around identity (Entra), the core services and their security settings.

Practise in AI Interview™Rehearse these questions, scored.Plan with Career Coach™A personalised path to your goal.Evidence it in Career Passport™Prove this skill to employers.

Employability Intelligence

Where this knowledge takes you — the jobs, skills and certifications it feeds into.

Relevant roles

Help Desk AnalystDesktop SupportM365 AdministratorAzure Administrator

Skills you're proving

Microsoft 365Entra IDM365 securityAdministration

Recommended certifications

CompTIA Security+

Career progression

M365 Fundamentals → MS-900/SC-900 → M365/Azure Administrator.

What employers expect

That you can support and help secure the Microsoft 365 environment most organisations rely on.

Frequently asked questions

What is Microsoft 365?

A cloud platform of productivity and security services (Exchange, Teams, SharePoint, OneDrive, Defender) built on Entra ID identity.

Which certification does this support?

It maps to Microsoft MS-900 (M365 Fundamentals) and SC-900 (Security, Compliance & Identity).

Do you re-teach identity here?

No — identity links to the single authoritative Entra ID article to avoid duplication.

Practise what you've learned

Turn this guide into real, evidenced progress

Missiora helps you measure, improve and evidence the capabilities employers actually value — start with the tools best suited to this topic.

Published by

Missiora

Missiora is an AI Employability Intelligence platform. Our resources are researched and reviewed by the Missiora team to help you measure, improve and prove your career readiness.