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AB-900 Study Guide

Domain 1: M365 Core Features & Objects

  • Welcome to Microsoft 365
  • Exchange Online: Mailboxes & Distribution
  • SharePoint: Sites, Libraries & Permissions
  • Microsoft Teams: Teams, Channels & Policies
  • Users, Groups & Licensing
  • Zero Trust: Never Trust, Always Verify
  • Authentication: Passwords, MFA & Beyond
  • Microsoft Defender XDR
  • Microsoft Entra: Your Identity Hub
  • PIM, Audit Logs & Identity Governance

Domain 2: Data Protection & Governance

  • Microsoft Purview: The Big Picture
  • Sensitivity Labels & Data Classification
  • Data Loss Prevention (DLP)
  • Insider Risk & Communication Compliance
  • DSPM for AI & Data Lifecycle
  • How Copilot Accesses Your Data
  • Responsible AI Principles
  • Compliance Manager & eDiscovery
  • Activity Explorer & Data Monitoring
  • Oversharing in SharePoint

Domain 3: Copilot & Agent Admin

  • What is Microsoft 365 Copilot? Free
  • What Are Agents? Free
  • Copilot vs Agents: When to Use Which Free
  • Copilot Licensing: Monthly vs Pay-as-You-Go Free
  • Researcher, Analyst & Real-World Use Cases Free
  • Managing Copilot: Billing, Monitoring & Prompts Free
  • Building Agents: Create, Test & Publish Free
  • Agent Lifecycle: Access, Approval & Monitoring Free

AB-900 Study Guide

Domain 1: M365 Core Features & Objects

  • Welcome to Microsoft 365
  • Exchange Online: Mailboxes & Distribution
  • SharePoint: Sites, Libraries & Permissions
  • Microsoft Teams: Teams, Channels & Policies
  • Users, Groups & Licensing
  • Zero Trust: Never Trust, Always Verify
  • Authentication: Passwords, MFA & Beyond
  • Microsoft Defender XDR
  • Microsoft Entra: Your Identity Hub
  • PIM, Audit Logs & Identity Governance

Domain 2: Data Protection & Governance

  • Microsoft Purview: The Big Picture
  • Sensitivity Labels & Data Classification
  • Data Loss Prevention (DLP)
  • Insider Risk & Communication Compliance
  • DSPM for AI & Data Lifecycle
  • How Copilot Accesses Your Data
  • Responsible AI Principles
  • Compliance Manager & eDiscovery
  • Activity Explorer & Data Monitoring
  • Oversharing in SharePoint

Domain 3: Copilot & Agent Admin

  • What is Microsoft 365 Copilot? Free
  • What Are Agents? Free
  • Copilot vs Agents: When to Use Which Free
  • Copilot Licensing: Monthly vs Pay-as-You-Go Free
  • Researcher, Analyst & Real-World Use Cases Free
  • Managing Copilot: Billing, Monitoring & Prompts Free
  • Building Agents: Create, Test & Publish Free
  • Agent Lifecycle: Access, Approval & Monitoring Free
Domain 1: M365 Core Features & Objects Premium ⏱ ~11 min read

Microsoft Teams: Teams, Channels & Policies

Teams is where modern work happens — meetings, chat, calls, and apps. As an admin, you manage teams, channels, and the policies that govern them all.

What is Microsoft Teams?

☕ Simple explanation

Teams is your office building — but digital.

Each team is a department or project room. Inside each room, channels are like whiteboards for different topics. You walk in, join a conversation, hop on a meeting, or share a file — all without leaving the room.

As an admin, you’re the building manager. You decide who can create rooms (teams), what rules apply (policies), and whether guests can enter (external access).

Microsoft Teams is a unified collaboration platform that integrates chat, video meetings, voice calls, file storage (via SharePoint), and app integrations. It’s the hub for teamwork in Microsoft 365.

Every team has an underlying M365 Group and SharePoint site. Channels organise conversations within a team. Policies (managed in the Teams admin center) control feature availability — from meeting settings to messaging permissions to app usage.

Teams objects for the exam

Teams and channels

Teams and channel types
FeatureWhat It IsWho Can CreateExample
TeamA collaboration space for a group of peopleAnyone (or restricted by admin policy)Marketing Team, Project Phoenix, IT Support
Standard channelOpen conversation topic within a teamAny team member#general, #campaign-planning, #questions
Private channelRestricted conversation — only invited membersTeam members (if policy allows)#leadership-only, #salary-discussions
Shared channelCross-team collaboration — members from different teamsTeam owners (if policy allows)#cross-team-budget shared between Finance and Marketing

Key exam concept: Every team has a General channel that can’t be deleted. Private channels have their own separate SharePoint site (with separate permissions). This matters for Copilot — private channel content is only visible to channel members.

Policies — admin controls

Policies are how admins control what users can do in Teams. The exam tests these:

Policy TypeWhat It ControlsExample
Meeting policiesWho can record, who can present, lobby settings”Only organisers can record meetings”
Messaging policiesEmoji, GIFs, URL previews, message editing/deletion”Disable GIFs in formal channels”
App permission policiesWhich third-party apps are allowed”Block all apps except Microsoft-approved ones”
Calling policiesVoice calling features, call forwarding”Enable voicemail for all users”
Teams policiesTeam feature settings, discovery, channel creation”Only owners can create private channels”
💡 Scenario: Clearfield Council's Teams governance

Clearfield Council has strict communication rules. Director Chen configures:

  1. Meeting policy: All meetings auto-recorded and stored for compliance
  2. Messaging policy: URL previews enabled, GIFs disabled in council chambers channel
  3. App policy: Only Microsoft first-party apps allowed — all third-party apps blocked
  4. M365 Group creation policy (via Entra): Only IT and department heads can create new teams (prevents sprawl)
  5. Guest access: Enabled ONLY for approved partner organisations (B2B guests added to teams)
  6. External access: Federated chat/calls allowed ONLY with trusted domains

These policies apply per-user or per-group — Director Chen assigns stricter policies to councillors and standard policies to admin staff.

The Teams admin center

Key areas in admin.teams.microsoft.com:

SectionWhat You Manage
Teams → Manage teamsView, edit, archive, or delete teams
UsersPer-user policy assignments
Meetings → Meeting policiesRecording, transcription, lobby, screen sharing
Messaging → Messaging policiesChat features, formatting, emoji
Teams apps → Permission/Setup policiesWhich apps are available to users
VoiceCalling policies, auto-attendants, call queues
Org-wide settingsExternal access, guest access, Teams settings

Teams ↔ SharePoint connection

Every Teams team has a SharePoint team site behind it:

  • The Files tab in a Teams channel = a SharePoint document library
  • Files shared in Teams chat are stored in the sender’s OneDrive
  • Private channels get their own separate SharePoint site

This means SharePoint permissions and Teams membership are tightly linked. When Copilot searches Teams content, it’s actually querying SharePoint and Microsoft Graph.

🎬 Video walkthrough

🎬 Video coming soon

Microsoft Teams Essentials — AB-900 Module 4

Microsoft Teams Essentials — AB-900 Module 4

~9 min

Flashcards

Question

What's the difference between a standard, private, and shared channel?

Click or press Enter to reveal answer

Answer

Standard = open to all team members. Private = restricted to invited members only (has its own SharePoint site). Shared = allows members from different teams to collaborate.

Click to flip back

Question

Where are Teams meeting recordings stored?

Click or press Enter to reveal answer

Answer

Meeting recordings are stored in OneDrive (for non-channel meetings) or SharePoint (for channel meetings). They're no longer stored in Microsoft Stream (classic).

Click to flip back

Question

What's the connection between Teams and SharePoint?

Click or press Enter to reveal answer

Answer

Every Teams team has a SharePoint team site. The Files tab is a SharePoint document library. Private channels get their own separate SharePoint site. This means SharePoint permissions affect what Copilot can see in Teams content.

Click to flip back

Knowledge Check

Knowledge Check

Northwave wants to allow the marketing team to create their own channels but prevent anyone except IT from creating new teams. Where does Maya configure this?

Knowledge Check

Clearfield Council needs to ensure that conversations in the 'Council Chambers' private channel are only visible to councillors — not regular staff, and not Copilot when used by non-members. Which statement is TRUE?


Next up: Users, Groups & Licensing — the objects that determine who gets access to what across Microsoft 365.

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SharePoint: Sites, Libraries & Permissions

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Users, Groups & Licensing

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