MS-203T00: Microsoft 365 Messaging

Prepare to pass the MS-203: Microsoft 365 Messaging exam in a 5-day course.

Microsoft Associate Certification Badge-min
Web 1920 – 86-min

Course Description

This course examines the key elements of Microsoft 365 messaging administration, including message transport and mail flow, messaging security, hygiene, and compliance, messaging infrastructure, and hybrid messaging. This course is designed for persons who are aspiring to be Messaging Administrators in a Microsoft 365 deployment.

Audience Profile

The Messaging Administrator plans, deploys, configures, troubleshoots, and secures the messaging infrastructure in a hybrid and cloud enterprise environment. Responsibilities include managing recipients, mailboxes, transport, mail flow, administrative roles, threat protection, compliance, migrations, and client connectivity. To implement a secure hybrid topology that meets the business needs of a modern organization, the Messaging Administrator must collaborate with other workload administrators and the Microsoft 365 enterprise administrator. The Messaging Administrator should have a working knowledge of authentication types, licensing, and integration with Microsoft 365 applications.


About this course

Course Outline

Manage Microsoft Exchange Online settings and resources (40–45%)

Manage organizational and client access settings in Exchange Online

  • Manage a global address list (GAL)

  • Add or remove an offline address book (OAB)

  • Manage address book policies

  • Plan and configure organization relationships and individual sharing

  • Configure Outlook on the web policies

Manage recipients and resources

  • Manage user mailboxes

  • Manage resource mailboxes

  • Manage shared mailboxes

  • Create and manage mail contacts and mail users

  • Manage groups, including distribution lists, dynamic distribution lists, mail-enabled security groups, and Microsoft 365 groups

  • Manage mailbox permissions, including delegation

  • Manage mailbox mail flow settings

  • Create and manage public folders

Manage Exchange hybrid settings and migration

  • Configure virtual directories and URLs in a hybrid environment

  • Maintain and expand the configuration by using the Hybrid Configuration wizard

  • Configure migration endpoints

  • Create and manage a cross-tenant migration batch

Plan and manage the mail transport architecture (25–30%)

Manage and secure mail flow

  • Plan and configure connectors

  • Plan and implement mail flow rules (transport rules)

  • Manage accepted and remote domains

  • Configure namespaces, accepted domains, and DNS records, including Exchange Online Protection (EOP)

  • Implement email authentication, including Sender Policy Framework (SPF), DomainKeys Identified Mail (DKIM), and Domain-based Message Authentication, and Reporting and Conformance (DMARC)

Troubleshoot mail flow

  • Configure and manage alert policies

  • Trace a message

  • Analyze a message trace

  • Analyze message headers

  • Analyze non-delivery reports (NDRs)

  • Troubleshoot by using the Microsoft Remote Connectivity Analyzer

Secure the messaging environment (25–30%)

Manage role-based permissions in Exchange Online

  • Plan and manage RBAC roles

  • Manage default and custom admin role groups

  • Manage user roles

Secure messages by using Microsoft 365 Defender

  • Configure and manage anti-phishing policies

  • Configure and manage anti-spam policies

  • Configure and manage anti-malware policies

  • Configure and manage Safe Attachments

  • Configure and manage Safe Links

  • Configure and manage quarantine policies

Manage compliance

  • Configure Messaging Records Management (MRM) and retention policies for a specific mailbox folder

  • Enable and configure archive mailboxes

  • Manage inactive mailboxes

  • Analyze audit logs

  • Manage journal rules

  • Manage content search

  • Manage standard eDiscovery cases (not including Premium eDiscovery)


This course is designed for persons who are aspiring to the Microsoft 365 Messaging Administrator role.


This will be a virtual event hosted on Microsoft Teams. In the Microsoft Teams platform and sessions, your name, email address, or title may be viewable by other participants. By joining this event, you agree to this experience. 

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