MS-203 Practice Test

MS-203 Exam at a Glance

What the MS-203 is and how it works

According to Microsoft, “Most Microsoft Certification exams typically contain between 40-60 questions; however, the number can vary depending on the exam.”^[1]

Microsoft describes the candidate for this exam as a Microsoft 365 messaging administrator who manages a secure, efficient and effective email collaboration platform using Microsoft Exchange Online and Microsoft 365. If your daily work involves mailboxes, mail flow, hybrid connections or protecting messages, the exam content will look familiar.

Microsoft states that candidates can usually choose between a local test center and an online proctored exam, depending on availability for that exam and provider. Delivery options can differ by region, so confirm what is offered to you when you book through Pearson VUE.

Most Microsoft certification exams typically contain 40-60 questions, although the number can vary by exam. Technical exam scores are reported on a scale of 1 to 1,000, and a passing score is 700 or greater. For most exams you receive results within minutes of finishing, along with a report that shows your score and feedback on your performance.

Two points deserve a careful read on Microsoft's own pages. Role-based certifications are valid for 1 year from the date you complete all requirements. However, Microsoft's Microsoft 365 Messaging Administrator certification page states that this certification and the renewal assessment are retired. Before you plan around this exam, check the official exam page and your Microsoft Learn profile for its current status. Our practice questions are written by us and are not real exam questions.

MS-203 content outline and where to practise each area

The content areas below are copied from the official MS-203 content outline published by Microsoft. The right-hand column shows which of our practice sets covers it.

Worked examples: how to reason through MS-203 questions

These are practice questions written for this site, not questions from the real exam. Each explanation shows why the right answer is right and why the others are wrong.

Example 1

Question: What is the mailbox size limit for a shared mailbox before an Exchange Online Plan 2 license is required?

1. 10 GB
2. 25 GB
3. 50 GB
4. 100 GB

Answer: C. 50 GB

Explanation:

The correct answer is 50 GB. A shared mailbox can grow to that size without its own licence, and going beyond it requires an Exchange Online Plan 2 licence. The other options are wrong because they invent limits: 10 GB and 25 GB are too low for the unlicensed ceiling, and 100 GB is the size you can reach only after the licence is in place, not the point at which you need one. The general rule to remember is that shared mailboxes are a licence-free convenience up to a fixed size, and the size limit, not the number of users, is what triggers a licence requirement. When a question asks what forces a licence, look for a size threshold first.

Example 2

Question: What is the default behavior when a user with FullAccess permission accesses a shared mailbox in Outlook?

1. The shared mailbox opens as a separate profile
2. The shared mailbox is automatically mapped and appears in the Outlook folder list
3. The user must enter credentials for the shared mailbox
4. The shared mailbox only appears in Outlook on the Web

Answer: B. The shared mailbox is automatically mapped and appears in the Outlook folder list

Explanation:

The correct answer is that the shared mailbox is automatically mapped and appears in the Outlook folder list. This is automapping, which happens when a user has FullAccess permission. A separate profile is wrong because the mailbox is added to the existing profile. Entering credentials is wrong because the user's own sign-in already covers access. Saying it appears only in Outlook on the Web is wrong because the desktop client also shows it. The rule to remember is that FullAccess grants the right to open the mailbox, and automapping is the default way Outlook displays it. If a question asks why a mailbox did or did not appear, check how the permission was granted.

Example 3

Question: What happens to public folder data when you migrate from Exchange on-premises to Exchange Online?

1. It is automatically migrated with mailboxes
2. It must be migrated using a separate public folder migration batch
3. Public folders are not supported in Exchange Online
4. It is converted to shared mailboxes automatically

Answer: B. It must be migrated using a separate public folder migration batch

Explanation:

The correct answer is that public folder data must be migrated using a separate public folder migration batch. Public folders are not carried along when mailboxes move, so the first option is wrong. The claim that public folders are not supported in Exchange Online is wrong, because they remain available there. Automatic conversion to shared mailboxes is also wrong, since the content keeps its public folder structure unless you deliberately redesign it. The rule to remember is that mailbox migration and public folder migration are distinct workloads with their own planning, batches and cutover steps. When a hybrid or migration question mentions public folders, expect a dedicated process.

How to use these practice tests

Start with the official skills outline from Microsoft so you know the three content areas: Exchange Online settings and resources, mail transport, and securing the messaging environment. Then take one of our general sets, such as the Microsoft 365 Basic or MCQ set, without notes to find your weak areas.

Next, work through the topic sets that match those gaps. After each session, write down every question you missed along with the rule behind the correct answer, not just the answer itself. Review that list at the start of your next session instead of re-reading everything.

Pair practice with hands-on work. If you have access to a test tenant, repeat what the questions describe: create a shared mailbox, build a connector, set up a transport rule, run message trace. Reading about a setting sticks far less than changing it and seeing the result.

Close to test day, mix topics in the hybrid and migration, role-based access control and troubleshooting sets, since real scenarios cross several areas. Read each question for the constraint it states, such as licence, permission or routing, before looking at the options. Remember that our questions are written by us and are not real exam questions, so use them to test understanding, not to memorise wording. Check Microsoft's exam page for the current status before you book.

Sources & last verified

1. Microsoft — number of questions (official source). “Most Microsoft Certification exams typically contain between 40-60 questions; however, the number can vary depending on the exam.” Verified Nov 4, 2026 · source checked Oct 17, 2026.
2. Microsoft — passing score, score release (official source). “Technical exams: All technical exam scores are reported on a scale of 1 to 1,000. A passing score is 700 or greater.” Verified Nov 4, 2026 · source checked Oct 17, 2026.
3. Microsoft — validity (official source). “Microsoft role-based (associate and expert) and specialty Certifications are valid for one (1) year from the date that you complete all requirements to earn that…” Verified Nov 4, 2026 · source checked Oct 17, 2026.
4. Microsoft — renewal (official source). “This certification and the renewal assessment are retired.” Verified Nov 4, 2026.
5. home.pearsonvue.com — delivery (official source). “Microsoft states that candidates can usually choose between a local test center and an online proctored exam, depending on availability for that exam and provider.” Verified Nov 4, 2026.
6. Microsoft — eligibility, other (official source). “Candidates for this exam are Microsoft 365 messaging administrators who manage a secure, efficient, and effective email collaboration platform using Microsoft Exchange Online and Microsoft…” Verified Nov 4, 2026.

How we verify: editorial & fact-checking policy. Report an error: contact us.