MS-900 Practice Question: Describe Microsoft 365 pricing, licensing, and support
This MS-900 practice question tests your understanding of describe microsoft 365 pricing, licensing, and support. 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.
A company has a mix of Microsoft 365 E3 and E5 licenses. They want to ensure that all users have access to Microsoft Defender for Office 365 (Plan 2) without upgrading everyone to E5. What is the most cost-effective approach?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Purchase Microsoft Defender for Office 365 (Plan 2) as an add-on for E3 users
Option B is correct because Microsoft Defender for Office 365 (Plan 2) is available as an add-on license for Microsoft 365 E3 users, allowing them to gain the same advanced security capabilities as E5 users without upgrading their base plan. This is the most cost-effective approach since it avoids the higher per-user cost of upgrading all E3 users to E5 or purchasing standalone subscriptions that may not integrate as seamlessly with the existing E3 tenant.
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.
✗
Purchase a standalone Microsoft Defender for Office 365 Plan 2 subscription
Why it's wrong here
Defender for Office 365 Plan 2 is not available as a standalone subscription; it is an add-on.
✓
Purchase Microsoft Defender for Office 365 (Plan 2) as an add-on for E3 users
Why this is correct
This grants the required capabilities at a lower cost than upgrading to E5.
Related concept
Read the scenario before looking for a memorised answer.
✗
Downgrade E5 users to E3 and purchase add-ons for all
Why it's wrong here
This could be less cost-effective and disrupt existing E5 features.
✗
Upgrade all E3 users to E5 to include Defender for Office 365 Plan 2
Why it's wrong here
This is more costly if only the Defender capability is needed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume a standalone subscription is always the cheapest add-on option, but Microsoft specifically prices the E3 add-on lower than the standalone SKU to encourage upselling within the same licensing family, and the question tests awareness of this licensing hierarchy.
Detailed technical explanation
How to think about this question
Microsoft Defender for Office 365 Plan 2 includes advanced threat protection features such as automated investigation and response (AIR), threat hunting, and post-breach capabilities, which are not available in Plan 1. The add-on license for E3 users is a separate SKU (e.g., 'Microsoft Defender for Office 365 (Plan 2) for E3') that integrates directly with the existing E3 tenant, leveraging the same admin portal and policies without requiring a base plan change. In real-world scenarios, organizations often use this approach to provide uniform security coverage across mixed-license environments, ensuring all users are protected against sophisticated email and collaboration threats without overpaying for unused E5 features.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MS-900 question in full detail.
Describe Microsoft 365 pricing, licensing, and support — This question tests Describe Microsoft 365 pricing, licensing, and support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Purchase Microsoft Defender for Office 365 (Plan 2) as an add-on for E3 users — Option B is correct because Microsoft Defender for Office 365 (Plan 2) is available as an add-on license for Microsoft 365 E3 users, allowing them to gain the same advanced security capabilities as E5 users without upgrading their base plan. This is the most cost-effective approach since it avoids the higher per-user cost of upgrading all E3 users to E5 or purchasing standalone subscriptions that may not integrate as seamlessly with the existing E3 tenant.
What should I do if I get this MS-900 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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