MS-203: Microsoft 365 Messaging
MS-203: Microsoft 365 Messaging MS-203: Microsoft 365 Messaging MS-203: Microsoft 365 Messaging


Course description

This course examines the key elements of Microsoft 365 messaging management, including message transport and mail flow, message security, hygiene, and compliance, messaging infrastructure, and hybrid messaging. This course is designed for people who aspire to be messaging administrators in a Microsoft 365 deployment.


Audience Profile

The messaging administrator plans, implements, configures, and secures the messaging infrastructure in a cloud and hybrid enterprise environment, and fixes any issues that may arise. Responsibilities include recipient management, 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 must have working knowledge of authentication types, licenses and integration with Microsoft 365 applications.


Items in this collection

  • Explore transportation services (7 Units)
  • Configuring the message transport (6 Units)
  • Manage transportation rules (6 Units)
  • Manage mail flow (7 Units)
  • Troubleshoot Mail Flow (7 Units)
  • Solution of transport problems (6 Units)
  • Troubleshooting mail flow using logs (6 Units)
  • Plan the security of messages (6 Units)
  • Manage anti-malware and anti-spam policies (11 Units)
  • Explore Threat Protection in Microsoft 365 Defender (11 Units)
  • Explore messaging compliance in Microsoft 365 (7 Units)
  • Explore Messaging Compliance in Exchange (6 Units)
  • Manage Archiving and Auditing for Exchange Online (6 Units)
  • Manage content search (6 Units)
  • Manage authentication for messaging (8 Units)
  • Set up organization settings (6 Units)
  • Set up organization sharing (8 Units)
  • Manage administrator roles (8 Units)
  • User role management (6 Units)
  • Analyze role-based permissions (6 Units)
  • Explore the different types of Exchange recipients (9 Units)
  • Create and Manage Exchange Recipients (10 Pack)
  • Manage email addresses, lists and resources (8 Units)
  • Explore Exchange Hybrid Deployment Requirements (8 Units)
  • Plan and configure a hybrid deployment using the Hybrid Configuration Wizard (9 Units)
  • Provide a gateway for Internet email using Edge Transport servers (7 Units)
  • Implementation of advanced hybrid functionality (7 Units)
  • Troubleshooting Hybrid Deployments (8 Units)
  • Mailbox Migration Planning (6 Units)
  • Running IMAP Migrations (6 Units)
  • Execution of total and staged migrations (8 Units)
  • Run Advanced Mailbox Migrations (8 Units)


Course outline

Module 1: Transport pipeline management in Microsoft 365

In this module, you'll learn about the different transport components of Exchange, how message routing works, and how to configure message flow for your organization. You will examine the tasks that messaging administrators must complete to configure message transport. You will review message transport options and learn how to configure domains and connectors. You'll also learn how to manage transport rules, which are a very powerful configuration for controlling the flow of messages in your organization.


  • Exploration of transportation services

  • Configuring the message transport

  • Transport rules management

Lab : Configuring the message transport

  • Creating Connectors

After completing this module, students will be able to:

  • Describe the Exchange transport components

  • Plan effective message routing for your organization

  • Modify the message flow for the organization

  • Describe what shipping agents exist and what they do

  • Configure the different transport options

  • Plan and configure domains for organizations

  • Understand how receive and send connectors work

  • Understand what the transportation rules are

  • Describe how transport rules work

  • Configure custom transport rules

  • Describe how transport rules can be used for data loss prevention

Module 2: Managing and troubleshooting mail flow in Microsoft 365

In this module, you'll examine the components of mail flow and learn how to manage your mail flow, which is a crucial task for every Exchange administrator. You will study the differences between mail flow management in Exchange Online, Exchange Server, and Exchange Hybrid deployments. From managing mail flow, you'll move on to troubleshooting mail flow issues, such as emails that aren't routed correctly in or out of your organization, or when secure connections can't be established successfully. You'll learn about the tools Microsoft provides to help you find the root cause of your problems and fix your mail flow. You will then move from troubleshooting mail flow to troubleshooting transport issues, such as network issues, connector and agent issues, and architecture issues, as well as troubleshooting in coexistence. Finally, you'll learn how to check events, protocols, and trace logs when you've finished troubleshooting message transport and service availability and a problem still persists, or if you need to find historical data about issues in the past.


  • Mail flow management

  • Troubleshooting mail flow

  • Solution of transport problems

  • Troubleshooting mail flow using logs

Lab : Conditional Mail Routing

  • Create mail flow rules

After completing this module, students will be able to:

  • Manage mail flow in organizations

  • Understand mail flow for Exchange servers

  • Manage mail flow for Exchange Online

  • Describe and manage mail flow in hybrid environments

  • Understand how to troubleshoot SMTP mail flow

  • Describe how to troubleshoot a shared namespace

  • Describe how to troubleshoot encryption with TLS

  • Understand how alert policies can be used to troubleshoot mail flow

  • Troubleshoot network-based

  • Describe connector and agent troubleshooting procedures

  • Plan architecture troubleshooting

  • Understand how to troubleshoot coexistence

  • Create searches for the message tracking log

  • Describe how to troubleshoot using protocol logs

  • Understand how to work with the event log for Exchange

Module 3: Managing Message Security

In this module, you will learn about the features and functionality of Microsoft Exchange Online Protection (EOP). You'll also learn how to plan messaging routing for this service, which not only provides anti-malware and anti-spam policies that protect your organization against spam and malware, but also safeguards your organization against messaging policy violations. You'll then review the anti-malware and anti-spam protection provided by Exchange Server and Online Protection, and learn how to configure SPAM and malware filters, policies, and settings to provide protection for your users. You will conclude the module by examining Defender for Office 365 and how it extends the protection provided by EOP by filtering targeted attacks that could pass through the EOP line of defenses, including advanced threats such as zero-day attacks on email attachments and Office documents and point-of-click protection against malicious URLs. You'll learn how Defender for Office 365 protects users from advanced threats through features like safe attachments and safe links, and how it generates reports that give administrators insight into email attacks targeting their tenants.


  • Message security planning

  • Anti-malware and anti-spam policy management

  • Explore threat protection in Microsoft 365 Defender

Lab : Managing Message Hygiene

  • Creation of hygiene filters

After completing this module, students will be able to:

  • Explain the use and features of Exchange Online Protection

  • Plan message routing for Exchange Online Protection

  • Investigate available EOP reports and logs

  • Understand the different message header fields relevant to spam and phishing protection

  • Configure anti-spam and anti-malware filters on Exchange Server

  • Use additional features for outbound spam filtering and quarantine

  • Implement phishing and electronic spoofing protection features

  • Create transport rules for custom requirements

  • Description of Microsoft Defender for Office 365 features

  • Describe the protection provided by the Safe Attachments and Safe Links policies

  • Understand anti-spoofing intelligence features

  • Describe how Microsoft Defender anti-phishing policies work

  • Information on how to use Configuration Analyzer

  • Manage tenant allow or block list in Microsoft 365 Defender

  • Understand advanced search features

Module 4: Managing compliance in Microsoft 365

This module begins by describing the different compliance features in Microsoft 365 that messaging administrators can use to comply with legal and regulatory requirements. This module supports compliance in Exchange by examining the compliance features available in the Exchange Admin Center for Exchange Server and hybrid deployments. Due to the complex retention requirements of modern messaging environments, this module focuses on how archiving is done with Exchange so that you can provide an efficient and compliant environment for your users. You'll also examine how additional archive storage is provided to your users, how messages are automatically processed and archived, and how you audit the log in Exchange that provides information about administrator, delegate, and user actions on users' mailboxes and their mailboxes. exchange organization. Finally, because organizations must meet legal discovery requirements (related to organizational policy, compliance, or lawsuits), you'll examine how eDiscovery for Microsoft Exchange can help you perform discovery searches for relevant content within mailboxes.


  • Explore messaging compliance in Microsoft 365

  • Explore messaging compliance in Exchange

  • Managing Exchange Online auditing and archiving

  • Content search management

Lab : Managing Messaging Compliance

  • Messaging compliance management

After completing this module, students will be able to:

  • Describe different policies and compliance features for messaging

  • Microsoft 365 Permissions Model Assessment

  • Plan retention policies for Exchange Online mailboxes

  • Create message traces to understand mail flow in your Exchange Online organization

  • Describe litigation holds and in-place retention in Exchange Server

  • Plan retention and deletion with message records management (MRM)

  • Investigate the message tracking log in the Exchange organization

  • Describe what local archiving is and how it works

  • Understand the differences between journaling and archiving

  • Understand what the mailbox and administrator audit logs are used for

  • Understand content searches to find messages in your organization

  • Describe eDiscovery and on-premises eDiscovery scenarios for Exchange

Module 5: Managing the Microsoft 365 messaging environment

This module begins with an exam on how to manage authentication for messaging. This module focuses on how to ensure that user accounts are well protected and secure, and how to implement multiple security features that do not introduce unnecessary complexity into users' daily work, which can result in lower business productivity and new risks. of security. You'll then move from messaging authentication to organization settings, where you'll learn how to configure settings that apply to the entire organization or to many users in the organization. Finally, you'll examine how to set up organizational sharing.


  • Manage authentication for messaging

  • Configuring organizational settings

  • Configuring Organizational Sharing

After completing this module, students will be able to:

  • Configure password policy options

  • Set up self-service password management

  • Implement multi-factor authentication

  • Plan password policies

  • Configure modern authentication in Exchange Online

  • Configure workload and throttling policies

  • Configuring quota settings

  • Deploy integrated Microsoft 365 apps

  • Provide an overview of the exchange features of Exchange federated delegation

  • Describe federated sharing components

  • Explain considerations for designing and implementing certificates and federation trusts

  • Implement organization relationships

  • Implement sharing policies

Module 6: Managing role-based permissions in Microsoft 365

This module examines how messaging administrators manage role-based permissions, which is an essential task for any messaging administrator. Because Exchange Server and Exchange Online use the Role-Based Access Control (RBAC) permission model, this module examines the basics of RBAC management. The module concludes by examining how a messaging administrator should carefully plan and configure permissions so as not to put their entire Active Directory or environment at risk.


  • Admin role management

  • Manage user roles

  • Role-based permission analysis

Managing roles and permission policies

  • Managing roles and permission policies

After completing this module, students will be able to:

  • Describe how RBAC is used to assign roles to users

  • Understand what management role group exists for administrative tasks

  • Assign built-in admin roles for administration

  • Create custom admin roles and assign them using user role assignment policies

  • Troubleshooting RBAC management roles

  • Describe the built-in end-user roles

  • Configure role assignment policies

  • Create custom roles and role assignment policies

  • Understand the differences between shared permissions and split permissions

  • Describe multi-forest permissions

  • Identify differences between permit models

Module 7: Managing recipient objects and resources in Microsoft 365

This module examines some of the most common tasks messaging administrators perform: creating and configuring email recipients, lists, and resources. This module examines the different types of Exchange Server recipients, including the difference between them. The module then focuses on the various tasks that require you to create and manage Exchange recipients in Exchange, including user mailboxes, resource mailboxes, public folder, shared mailboxes, mail contacts, and mail users. . You'll also learn how to manage permissions for recipients and how to create and manage groups.


  • Explore the different types of Exchange recipients

  • Creating and managing Exchange recipients

  • Management of email addresses, lists and resources

Lab : Implementing Public Folders

  • Public folder creation

  • Public folder management

Lab : Creating recipient objects and resources

  • Creating Exchange recipients

  • create groups

After completing this module, students will be able to:

  • Describe the different recipient objects in Exchange

  • Describe resource mailboxes

  • Describe shared mailboxes

  • Describe linked mailboxes

  • describe the groups

  • Describe public folders

  • Create and manage mailbox settings

  • Create and manage shared and resource mailboxes

  • Create and manage mail contacts and mail users

  • Create and manage recipient permissions

  • Create and manage groups

  • Public folder creation and management

  • Describe address lists

  • Explain how to configure address lists

  • Describe address book policies

  • Explain how to set up offline address books

  • Describe email address policies

Module 8: Hybrid Deployment Lifecycle Management

In this module, you will examine the requirements needed to get a hybrid deployment up and running, and learn about the features and components that are required when implementing a hybrid deployment. This module examines all the planning aspects required before running the hybrid configuration wizard. This includes HCW configuration options, as well as details about Organization Configuration Transfer (OCT) and Hybrid Agent. The module concludes with a review of mail flow options for a hybrid deployment. This module also examines Edge Transport servers and their use in hybrid Exchange deployments. You'll then learn about the requirements and best practices for setting up a hybrid deployment, which is the first step for your Exchange organization, whether you want to connect your on-premises Exchange and Exchange Online organizations for long-term coexistence or as part of a cloud migration strategy In this module, you'll examine how to manage a hybrid deployment and implement advanced hybrid functionality. It will cover features that require a successful hybrid deployment, such as storing OneDrive for Business attachments for on-premises mailboxes. This module concludes with an introduction to troubleshooting techniques for a hybrid deployment. You will learn how to troubleshoot directory synchronization, including pass-through authentication (PTA) and single sign-on, Exchange transport and client access troubleshooting, as well as replication service troubleshooting of mailboxes.


  • Explore the Exchange hybrid deployment requirement

  • Planning and configuring a hybrid deployment using the Hybrid Configuration Wizard

  • Providing a gateway for Internet email using Edge Transport servers

  • Implementation of advanced hybrid functionality

  • Troubleshooting hybrid deployments

Lab : Implementing a hybrid environment

  • Hybrid Deployment Configuration

Lab : Implementing a hybrid environment

  • Hybrid Deployment Test

  • Troubleshooting Hybrid Deployment

Lab : Preparing Azure AD for hybrid sync

  • Prepare Azure AD for hybrid sync

After completing this module, students will be able to:

  • Describe the connection options available to connect Exchange on-premises with Microsoft 365

  • List and describe the components of a hybrid Exchange deployment

  • Describir Azure Active Directory Connect (Azure AD Connect)

  • Identify Microsoft 365 identity options for Hybrid Exchange

  • Compare Exchange Delegated Federation with OAuth

  • Plan your hybrid Exchange setup

  • Describe the transfer of organization settings

  • Explain Modern Hybrid Exchange and Hybrid Agent

  • Plan mail flow options for a hybrid Exchange deployment

  • Describe the prerequisites for running the Microsoft 365 Hybrid Configuration Wizard

  • Explain best practices for implementing a hybrid deployment of Exchange

  • Describe the purpose and functionality of Edge Transport servers

  • Explain infrastructure requirements for Edge Transport servers

  • Describe EdgeSync

  • Schedule message flow with an Edge Transport server

  • Managing a Hybrid Exchange Deployment

  • Explain how to configure OAuth for a hybrid Exchange deployment

  • Describe how OneDrive for Business attachments are configured for on-premises mailboxes

  • Troubleshoot directory synchronization

  • Fix passed-through authentication and single sign-on issues

  • Troubleshoot transport issues with Exchange Online

  • Troubleshooting Client Access in a Hybrid Exchange Deployment

  • Troubleshoot the Mailbox Replication Service

Module 9: Managing Mailbox Migrations

This module examines the options available for migrating email to Exchange Online. This module summarizes the migration and coexistence options and recommends when to use which option. The module then examines the requirements for running an IMAP migration, the migration options that are available, and the steps that are performed during a migration. The module then examines how to plan and perform a phased and transition migration. Compare each of these two migration approaches, and you'll learn about the requirements, planning activities, and migration process for each option. The module concludes by looking at other important migration tasks, such as cross-tenant migrations and PST migrations.


  • Planning mailbox migrations

  • Running IMAP migrations

  • Running Full and Phased Migrations

  • Running advanced mailbox migrations

Lab : Planning a mail migration to Microsoft 365

  • Paper-based class exercise: Planning a mail migration to Microsoft 365

After completing this module, students will be able to:

  • Describe migration and coexistence strategies with Exchange Online

  • Describe the considerations that affect which migration option to use

  • Determine if DNS MX records should be changed during a mailbox migration

  • Describe the requirements for an IMAP migration and how it is carried out

  • Move mailbox data using an IMAP migration

  • Describe the requirements for staged and full migrations

  • Identify the steps required to perform staged and full migrations

  • Create and manage migration batches in the Exchange Admin Center

  • Import PST files to Exchange Online mailboxes

  • Perform a cross-tenant migration

  • Prepare target user objects for a cross-tenant migration



Previous requirements

This course is designed for people who are aspiring to the role of Microsoft 365 messaging administrator.



  • English course
  • Labs: English