Microsoft MS-203 Exam : Microsoft 365 Messaging

  • Exam Code: MS-203
  • Exam Name: Microsoft 365 Messaging
  • Updated: Sep 07, 2025
  • Q & A: 396 Questions and Answers

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Planning & Managing Mail Architectures: 20-25%

  • Manage Mail Flow: the students should be able to manage domains, transport rules, and hybrid mail flow.
  • Troubleshoot Mail Flow: the examinees need expertise in analyzing message headers, message trace, and NDRs; validating inbound & outbound mail flow; investigating transport logs, as well as monitoring mail flow.
  • Plan & Configure Transport Architecture: this domain covers the skills in creating and configuring connectors, configuring connectors between the tenants, and planning connectors.

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

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Main Information about MS-203

The goal of the Microsoft MS-203 exam is to certify one’s ability to manage modern messaging infrastructure. Particularly, it focuses on skills needed to plan, configure, and secure a Microsoft messaging platform. In more elaborate terms, this test measures your adeptness at managing organizational settings and resources, planning & managing the mail architecture, planning as well as implementing a hybrid configuration and migration, and securing a messaging environment. Success in this validation earns you the Microsoft 365 Certified: Messaging Administrator Associate designation. It costs $165 to register for this 180-minute long exam in the US. To take this test, you can opt to attend an Authorized Test Center or complete MS-203 online — at home or office — while being monitored by an offsite proctor.

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

The following will be discussed in this section:

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

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