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.
Your company has 50 users on Microsoft 365 Business Premium. You need to provide phone system and audio conferencing capabilities. What should you do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add the Phone System and Audio Conferencing add-ons to the existing Business Premium licenses
Microsoft 365 Business Premium includes the rights to add Phone System and Audio Conferencing as add-ons. Option D is correct because you simply purchase the Phone System and Audio Conferencing add-on licenses for each user who needs those capabilities, without changing the base subscription. This is the most cost-effective and straightforward path to enable PSTN calling and dial-in conferencing for Business Premium users.
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 Microsoft 365 Business Voice
Why it's wrong here
Business Voice is a bundle that includes Phone System and Audio Conferencing, but may not be the only option.
✗
Purchase a Microsoft 365 Calling Plan subscription for each user
Why it's wrong here
Calling Plan is an add-on that requires Phone System, not a standalone solution.
✗
Upgrade all users to Microsoft 365 E5
Why it's wrong here
E5 includes Phone System and Audio Conferencing but is more expensive.
✓
Add the Phone System and Audio Conferencing add-ons to the existing Business Premium licenses
Why this is correct
These add-ons provide the needed capabilities.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the need for a Calling Plan with the Phone System and Audio Conferencing capabilities, or they mistakenly think Business Voice is still available, when in fact the correct path is to add the Phone System and Audio Conferencing add-ons to the existing Business Premium licenses.
Detailed technical explanation
How to think about this question
Phone System (formerly Cloud PBX) provides PBX functionality like call routing, hold, transfer, and auto attendants, while Audio Conferencing enables dial-in numbers for meetings. Both are licensed as add-ons to qualifying subscriptions like Business Premium, and they rely on SIP-based signaling and media traversal through Microsoft's telephony infrastructure. In a real-world scenario, you would then purchase a Calling Plan (domestic or international) as a separate add-on if you need outbound/inbound PSTN calling, but the question only asks for phone system and audio conferencing capabilities, not PSTN connectivity.
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: Add the Phone System and Audio Conferencing add-ons to the existing Business Premium licenses — Microsoft 365 Business Premium includes the rights to add Phone System and Audio Conferencing as add-ons. Option D is correct because you simply purchase the Phone System and Audio Conferencing add-on licenses for each user who needs those capabilities, without changing the base subscription. This is the most cost-effective and straightforward path to enable PSTN calling and dial-in conferencing for Business Premium users.
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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