Microsoft 365 Messaging : MS-203

  • Exam Code: MS-203
  • Exam Name: Microsoft 365 Messaging
  • Updated: Sep 07, 2026     Q & A: 396 Questions and Answers

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Required Technical Skills

To successfully serve as a messaging administrator, candidates should have proven knowledge and background experience in working with authentication types, integration, and licensing with the applications of the Microsoft 365 platform. Also, they should have a solid mastery of the following areas:

  • Client access
  • Messaging infrastructure
  • Hygiene management
  • Mailboxes
  • Hybrid configuration
  • Migration and transport

Microsoft MS-203 (Microsoft 365 Messaging) certification exam is designed to test the skills and knowledge of messaging administrators who work with Microsoft 365 messaging environments. Passing the exam demonstrates that candidates have the expertise to manage, deploy, and configure messaging infrastructure and manage recipients, permissions, and mail protection in Microsoft 365 environments.

To prepare for the MS-203 exam, Microsoft recommends that candidates take the Messaging Administrator Associate certification learning path, which includes online courses, hands-on labs, and practice exams. Candidates can also find study materials and resources on the Microsoft Learning website.

The MS-203 exam is one of the requirements for earning the Microsoft 365 Certified: Messaging Administrator Associate certification. Microsoft 365 Messaging certification is designed for professionals who want to demonstrate their ability to manage messaging infrastructure in a Microsoft 365 environment. By earning this certification, you can validate your skills and knowledge in managing messaging infrastructure, and differentiate yourself from other IT professionals in the job market.

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

Microsoft MS-203 Exam Syllabus Topics:

SectionWeightObjectives
Plan and manage mail transport architecture25–30%- Troubleshoot mail flow
  • 1. Perform message trace and analyze headers
  • 2. Interpret NDRs and transport logs
  • 3. Use connectivity analyzers
- Manage mail flow
  • 1. Configure hybrid mail flow
  • 2. Implement email authentication: SPF, DKIM, DMARC
  • 3. Create and manage transport rules
- Plan and configure connectors
  • 1. Implement enhanced filtering
  • 2. Configure cross-tenant connectors
  • 3. Create and manage inbound/outbound connectors
Secure the messaging environment25–30%- Manage permissions and security
  • 1. Implement data governance
  • 2. Manage audit logging and reporting
  • 3. Configure RBAC and admin roles
- Manage compliance
  • 1. Manage eDiscovery and content search
  • 2. Implement retention and journal rules
  • 3. Configure data loss prevention (DLP)
- Implement threat protection
  • 1. Manage Microsoft Defender for Office 365
  • 2. Configure anti-malware and anti-spam policies
  • 3. Set up quarantine policies
Manage Microsoft Exchange Online settings and resources40–45%- Manage organizational settings
  • 1. Configure organizational sharing and relationships
  • 2. Manage address lists and address book policies
  • 3. Configure email address policies
  • 4. Manage accepted and remote domains
- Plan and manage client access
  • 1. Troubleshoot client connectivity
  • 2. Manage Outlook on the web and mobile device policies
  • 3. Manage certificates and authentication
  • 4. Configure Autodiscover and virtual directories
- Manage recipients and resources
  • 1. Create and manage mailboxes, groups, and contacts
  • 2. Manage resource mailboxes and permissions
  • 3. Implement archive mailboxes and retention policies
  • 4. Manage email addresses and forwarding

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