Microsoft 365 Messaging - MS-203

Microsoft MS-203 test insides dumps
  • Exam Code: MS-203
  • Exam Name: Microsoft 365 Messaging
  • Updated: Jul 18, 2026
  • Q & A: 396 Questions and Answers
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Microsoft MS-203 Exam Syllabus Topics:
TopicDetails

Manage Organizational Settings and Resources (30-35%)

Plan and manage organizational settings- manage Global Address List (GAL)
- manage Offline Address Book (OAB)
- manage address book policies
- manage email address policies
- configure organizational sharing
- manage add-ins
Plan and manage client access- plan namespaces
- configure virtual directories and URLs
- configure global Outlook on the Web policies
- configure Autodiscover
- troubleshoot client access connectivity problems
- manage Exchange certificates lifecycle
- add and manage DomainKeys Identified Mail (DKIM) signatures to domains
Manage recipient resources- manage archive mailboxes
- manage resource mailboxes
- manage groups (distribution list, dynamic distribution list, mail-enabled security group, and Microsoft 365 group) by using the Classic or New Exchange admin center
- manage mailboxes
- manage mailbox permissions
- configure mailbox policies
- manage shared mailboxes
- evaluate license options
- Create and manage contacts (Mail contact and Mail user)
Manage mobile devices- configure mobile device mailbox policies
- configure mobile authentication methods
- configure and manage Outlook mobile
- manage mobile device access
- configure and manage ActiveSync

Plan and Manage the Mail Architecture (20-25%)

Plan and configure transport architecture- plan connectors
- create and configure connectors
- configure connectors between tenants
- configure enhanced filtering for connectors
Manage mail flow- manage transport rules
- manage accepted and remote domains
- manage hybrid mail flow
Troubleshoot mail flow- validate inbound and outbound mail flow
- trace a message by using the Classic or New Exchange admin center
- analyze a message trace
- analyze message headers
- analyze Non-Deliverable Reports (NDRs)
- investigate transport logs
- monitor Mail Flow
- troubleshoot by using the Microsoft Remote Connectivity Analyzer
- troubleshoot by using the Microsoft Support and Recovery Assistant

Plan and Implement a Hybrid Configuration and Migration (20-25%)

Plan and implement a hybrid environment- evaluate and configure hybrid free/busy access
- decide between Exchange Classic Hybrid and Exchange Modern Hybrid
- manage the Edge server role
- configure Organization Configuration Transfer (OCT)
- plan and configure the environment by using the Hybrid Configuration Wizard (HCW)
- deploy the Exchange Hybrid Agent
Plan and implement migration- evaluate migration methods, including cutover, staged, PST Imports, IMAP, Google Workspace (formerly G-Suite), batch migration by using the Exchange admin center
- configure migration endpoints in Microsoft 365, including tenant-to-tenant
- manage mailbox migration request batches by using the Classic or New Exchange admin center
- migrating from non-Microsoft messaging systems
- troubleshoot mailbox migration
Manage public folders- move content between public folder mailboxes
- create additional public folder mailboxes
- implement public folder Top Level Hierarchy (TLH)
- implement mail-enabled public folders
- plan and configure public folders
- manage hold and discovery for public folders
- plan a public folder migration to Microsoft 365

Secure the Messaging Environment (20-25%)

Manage role-based permissions- manage role groups
- assign user accounts to admin roles
- manage user roles
- manage a delegated Role-based Access Control (RBAC) setup
- plan RBAC roles for eDiscovery
Manage message hygiene using Exchange Online and Microsoft Defender for Office 365- plan for message hygiene
- configure and manage Anti-spam settings
- configure and manage Anti-malware policies
- monitor and review quarantined items
- plan and configure Spam Confidence Levels (SCL)
-configure and manage Safe attachments
-configure and manage Safe links
- configure and manage Anti-phishing
- manage spam and malicious email user submissions
Manage compliance- configure Exchange retention and retention policies
- configure Exchange data loss prevention policies
- configure Office 365 Labels, Retention and DLP policies
- configure and analyze audit logs
- manage journal rules
- manage content search
- manage eDiscovery cases

Reference: https://docs.microsoft.com/en-us/learn/certifications/exams/ms-203

Prerequisites for Taking Microsoft MS-203 Certification Exam

There are no strict requirements for taking MS-203. Nonetheless, you need a certain level of experience and proficiency in relevant skills to succeed in the official exam. Before attempting MS-203, ensure that you have a basic-level understanding of data models, user interface, and processes. You should also have in-depth knowledge of the capabilities, limitations, and applications of available modern messaging management tools.

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