Microsoft MS-203 : Microsoft 365 Messaging

MS-203 real exams

Exam Code: MS-203

Exam Name: Microsoft 365 Messaging

Updated: Aug 23, 2026

Q & A: 396 Questions and Answers

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Microsoft 365 Messaging Exam Certification Details:

Books / TrainingCourse MS-203T00-A: Microsoft 365 Messaging
Duration120 mins
Schedule ExamPearson VUE
Exam Price$165 (USD)
Sample QuestionsMicrosoft 365 Messaging Sample Questions
Exam NameMicrosoft 365 Certified - Messaging Administrator Associate
Number of Questions40-60
Passing Score700 / 1000
Exam CodeMS-203

Take the Microsoft MS-203 exam to validate your skills as a Messaging Administrator and earn the recognition of a subject matter expert in this field. Undoubtedly, MS-203 is a challenging test. But with the right resources and study guides, taking and passing it will be much less of a hassle. More so, acing such an exam qualifies you for a highly-recognized certificate, that is the Microsoft 365 Certified: Messaging Administrator Associate, making all the rigors of studying worthwhile. So, this post summarizes everything you need to know if you're planning to take MS-203.

Planning and managing the mail architecture (20-25%)

The following will be discussed in this section:

  • Working with Microsoft Exchange Databases
  • Plan connectors to control inbound and outbound mail flow in Microsoft Exchange Server 2013.
  • Analyze a message trace to troubleshoot and track the health of their organization's mail flow
  • Manage hybrid mail flow to combine on-premises and Exchange Online protection gateways which are mandatory to understand the functionality of mail flow scenarios in order to troubleshoot if any issue arrives
  • Manage transport rules mail flow rules in Exchange Online to look for specific conditions on messages that pass through your organization and take action on them.
  • Analyze message headers to scan all incoming messages for spam, malware, and other threats
  • Create and configure connectors and route mail to and receive mail from recipients outside of your organization, a partner through a secure channel, or a message-processing appliance.
  • Considerations for Databases and Logs
  • Validate inbound and outbound mail flow
  • Investigate transport logs to investigate an issue
  • Configure connectors between tenants to manage mail traffic between Office servers and tenants
  • Analyze Non-Deliverable Reports (NDRs) for an error code that indicates why your email wasn't delivered, solutions to help you get your email delivered, a link to more help on the web, and technical details
  • Manage domains and SMTP name spaces (also known as address spaces) that you configure in an Exchange organization to receive email messages.
  • Monitor Mail Flow
  • Using iSCSI for Accommodating Database Storage
  • Implementing iSCSI for Mailbox Database Storage
  • Trace a message via a delivery report feature in Microsoft Exchange Server 2016 which you can use to track delivery information about messages sent by and received from specific user mailboxes

Who should take the MS-203: Microsoft Microsoft 365 Messaging

MS-203: Microsoft 365 Messaging certification is for people who want to validate their skills and knowledge to deploy, configure, manage, and monitor messaging infrastructure, permissions, client access, mail protection, and mail flow in both on-premises, hybrid, and cloud enterprise environments. Background knowledge of messaging is not required; however, some general Exchange Online knowledge or experience would be beneficial.

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

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Microsoft MS-203 Exam Syllabus Topics:

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

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