Microsoft 365 Messaging : MS-203

  • Exam Code: MS-203
  • Exam Name: Microsoft 365 Messaging
  • Updated: Jul 22, 2026     Q & A: 396 Questions and Answers

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The Microsoft MS-203 test covers four topics. The exam questions will be extracted from each of these objectives. This means that the candidates must gain competence in the domains of the test before attempting it. The highlights of these topics are enumerated below:

Managing Organizational Resources & Settings: 30-35%

  • Manage Mobile Devices: this section requires that the test takers develop their expertise in configuring mobile authentication techniques & mobile device mailbox policies, configuring and managing ActiveSync, as well as managing mobile device access.
  • Plan & Manage Client Access: the examinees will need to demonstrate competence in planning namespaces; configuring Autodiscover and global Outlook on Web policies, virtual directories & URLs, as well as managing Exchange certificates lifecycle.
  • Plan & Manage Organizational Settings: this area will measure the skills of the candidates in managing add-ins, email address policies, address book policies, Offline Address Book, as well as Global Address List.

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Microsoft MS-203: Exam Details

The Microsoft MS-203 exam is the only test needed to get the Microsoft 365 Certified: Messaging Administrator Associate certificate. This test equips the professionals with the knowledge and skills associated with the management of organizational settings and resources, management of mail architecture, implementation of hybrid configuration and its movement, and conservation of the messaging properties.

To register for this exam, the applicants have to pay $165. This price is established for those individuals who sit for the test in the United States. If you take it in another country, the pricing can vary for you. You can check the actual cost on the official webpage. Currently, the certification exam is available in English only.

Microsoft MS-203: Exam Syllabus

The topics in the Microsoft MS-203 exam are divided into four main sections. They are as follows:

Domain 1. Manage Organizational Settings and Resources (30-35%)

Plan and manage organizational settings

  • Management of email address plans
  • Global Address List (GAL) management
  • Organizational sharing configuration
  • Management of add-ins
  • Offline Address Book (OAB) management
  • Management of address book plans

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

Once you’ve dealt with all those courses, you may wish to check the study guides available on Amazon for tests MS-203. One such example is:

  • How I Passed MS-203: Microsoft 365 Messaging Exam: Sure Shot Certification Tips by Empirical Matt Publications

    ‘How I Passed MS-203’ book takes a unique approach to help you prepare for your certification exam. The publisher surveys a couple of successful certified Messaging Administrators and distills their experiences into this 53-page book. Amongst other things, the respondents shared information about their preparation methods. The aim is that you glean wisdom from these individuals’ journey towards acing MS-203 and earning the associated certificate and use these lessons to guide your preparation. This resource makes your journey towards certification less lonely and enormously improves the odds of success in the real exam.

Microsoft MS-203 Exam Syllabus Topics:

SectionObjectives
Topic 1: Troubleshoot and monitor messaging environments- Resolve messaging issues
  • 1. Client connectivity issues
    • 2. Mail delivery troubleshooting
      - Monitor mail flow and service health
      • 1. Service health dashboards
        • 2. Message trace
          Topic 2: Manage client access and mobility- Configure Outlook and mobile access
          • 1. Exchange ActiveSync policies
            • 2. Outlook connectivity and authentication
              Topic 3: Manage mail flow- Configure mail routing
              • 1. Connectors and mail flow policies
                • 2. Transport rules
                  Topic 4: Manage and maintain Microsoft 365 messaging infrastructure- Plan and configure Exchange Online
                  • 1. Exchange Online setup and configuration
                    • 2. Mailbox types and licensing
                      - Manage recipients and resources
                      • 1. Distribution groups and mail contacts
                        • 2. User mailboxes and shared mailboxes
                          Topic 5: Manage messaging security and compliance- Data governance and compliance
                          • 1. Retention policies
                            • 2. Data Loss Prevention (DLP)
                              - Anti-spam and anti-malware protection
                              • 1. Safe Links and Safe Attachments
                                • 2. Microsoft Defender for Office 365 policies

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