MS-203 Questions and Answers: Microsoft 365 Messaging & MS-203 Practice Test

Microsoft 365 Messaging - MS-203 certification

Exam Code: MS-203

Exam Name: Microsoft 365 Messaging

Updated: Aug 11, 2026

Q & A: 396 Questions and Answers

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Planning and implementing a hybrid configuration and migration (20-25%)

The following will be discussed in this section:

  • Plan and configure public folders
  • Working with RBAC roles for eDiscovery
  • Role Groups in Exchange Online
  • Deploy the Exchange Hybrid Agent
  • Manage mailbox migration request batches
  • Move content between public folder mailboxes
  • Evaluate and configure hybrid free/busy access (NOT: ADFS, WAP and Not Azure AD
  • Evaluate migration methods, including cutover, staged, PST Imports, IMAP, G-Suite
  • Admin Roles with AzureAD
  • Manage the Edge server role
  • Create additional public folder mailboxes
  • Migrating from non-Microsoft messaging systems (NOT: not on-prem solutions)
  • Manage hold and discovery for public folders
  • Troubleshoot mailbox migration
  • Implement public folder Top Level Hierarchy (TLH)
  • Understanding Assigning Role
  • Decide between Exchange Classic Hybrid and Exchange Modern Hybrid
  • Implement mail-enabled public folders
  • Plan a public folder migration to Microsoft 365
  • Connect, IdFix because they belong to the Modern Desktop Admin)
  • Configure migration endpoints in Microsoft 365, including tenant-to-tenant
  • Plan and configure the environment by using the Hybrid Configuration Wizard (HCW)
  • Configure Organization Configuration Transfer (OCT)

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

Troubleshooting of mail flow

  • Message header analysis
  • Check-in mail flows
  • Researching tracing of messages
  • Tracing messages
  • Non-Deliverable Reports (NDRs) analysis
  • Use Microsoft Remote Connectivity Analyzer for troubleshooting
  • Use Microsoft Support and Recovery Assistant for troubleshooting
  • Investigation of transport logs
  • Validation of incoming and outgoing mail flow

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Microsoft MS-203 Exam Syllabus Topics:

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

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