The answer is to assign an Exchange Online license to the user. This is correct because in Microsoft 365, the mailbox is not automatically created when a user account is provisioned in Entra ID; instead, the license assignment acts as the trigger that instructs Exchange Online to provision the mailbox. Without an active Exchange Online license—whether from an E3, E5, or standalone plan—the user remains a directory-only object with no mailbox, and the provisioning process typically completes within 24 hours of the license being applied. On the MS-102 exam, this concept tests your understanding of the dependency between licensing and service provisioning, often appearing in scenario-based questions where a new user exists but cannot send or receive email. A common trap is assuming that creating the user in Entra ID alone is sufficient, or that assigning any Microsoft 365 license (like SharePoint) will create the mailbox. Remember the mnemonic: “No license, no mailbox—assign first, then it’s fixed.”
MS-102 Deploy and manage a Microsoft 365 tenant Practice Question
This MS-102 practice question tests your understanding of deploy and manage a microsoft 365 tenant. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An administrator has created a new user account in Microsoft Entra ID. To ensure the user has a mailbox in Exchange Online, what is the next step?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Assign an Exchange Online license to the user
In Microsoft 365, a user must be assigned an Exchange Online license (part of an E3, E5, or standalone plan) before a mailbox is automatically provisioned in Exchange Online. Without a license, the user object exists in Entra ID but has no mailbox; the license assignment triggers the mailbox creation process within 24 hours.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Assign an Exchange Online license to the user
Why this is correct
A license that includes Exchange Online (e.g., Office 365 E3) triggers mailbox provisioning.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create an Exchange mailbox manually
Why it's wrong here
Mailboxes are automatically created when a license is assigned; manual creation is not required.
✗
Run the Microsoft 365 Setup wizard
Why it's wrong here
Setup wizard is for initial tenant configuration, not for individual user mailbox creation.
✗
Configure DNS records for the domain
Why it's wrong here
DNS records are for mail routing after mailboxes exist, not for mailbox creation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think creating the user in Entra ID or configuring DNS automatically provisions a mailbox, but Microsoft 365 requires an explicit license assignment to enable the Exchange Online service plan for that user.
Detailed technical explanation
How to think about this question
Under the hood, the license assignment triggers a background process in Exchange Online that creates a mailbox database entry and assigns a user principal name (UPN) to the mailbox. The mailbox is not created until the license is applied, even if the user is synced from on-premises via Azure AD Connect. In hybrid deployments, a remote mailbox must be licensed before it can be migrated to Exchange Online.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MS-102 question in full detail.
Deploy and manage a Microsoft 365 tenant — This question tests Deploy and manage a Microsoft 365 tenant — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Assign an Exchange Online license to the user — In Microsoft 365, a user must be assigned an Exchange Online license (part of an E3, E5, or standalone plan) before a mailbox is automatically provisioned in Exchange Online. Without a license, the user object exists in Entra ID but has no mailbox; the license assignment triggers the mailbox creation process within 24 hours.
What should I do if I get this MS-102 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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