- A
Upgrade all users to Microsoft 365 E3 and add Phone System and Audio Conferencing.
Why wrong: This is significantly more expensive because it requires upgrading the entire plan to E3 (which includes many unnecessary features) plus the telephony add-ons.
- B
Add the Microsoft 365 Business Voice add-on for each user.
Business Voice is a cost-effective bundle that provides Phone System, Audio Conferencing, and a calling plan for Business Basic users. It is the recommended way to add these capabilities to Business plans.
- C
Purchase Phone System and Audio Conferencing as standalone add-ons separately.
Why wrong: Purchasing these as separate standalone add-ons would likely cost more per user than the bundled Business Voice add-on, which is priced to be the most economical option.
- D
Add the Microsoft Teams Phone Standard add-on.
Why wrong: Teams Phone Standard is the newer name for the Phone System add-on, but it does not include Audio Conferencing. You would still need to add Audio Conferencing separately, making it more expensive than the Business Voice bundle.
MS-900 Describe Microsoft 365 pricing and support Practice Question
This MS-900 practice question tests your understanding of describe microsoft 365 pricing 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 with 100 users has Microsoft 365 Business Basic licenses. They want to add Phone System and Audio Conferencing for all users to enable PSTN calling and dial-in capabilities. They wish to minimize additional costs. What is the most cost-effective licensing approach?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Add the Microsoft 365 Business Voice add-on for each user.
Option B is correct because Microsoft 365 Business Voice is a cost-effective add-on specifically designed for Business Basic, Standard, or Premium subscribers to add Phone System and Audio Conferencing capabilities. It bundles both PSTN calling and dial-in features into a single license, avoiding the higher cost of upgrading to E3 or purchasing separate add-ons.
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.
- ✗
Upgrade all users to Microsoft 365 E3 and add Phone System and Audio Conferencing.
Why it's wrong here
This is significantly more expensive because it requires upgrading the entire plan to E3 (which includes many unnecessary features) plus the telephony add-ons.
- ✓
Add the Microsoft 365 Business Voice add-on for each user.
Why this is correct
Business Voice is a cost-effective bundle that provides Phone System, Audio Conferencing, and a calling plan for Business Basic users. It is the recommended way to add these capabilities to Business plans.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Purchase Phone System and Audio Conferencing as standalone add-ons separately.
Why it's wrong here
Purchasing these as separate standalone add-ons would likely cost more per user than the bundled Business Voice add-on, which is priced to be the most economical option.
- ✗
Add the Microsoft Teams Phone Standard add-on.
Why it's wrong here
Teams Phone Standard is the newer name for the Phone System add-on, but it does not include Audio Conferencing. You would still need to add Audio Conferencing separately, making it more expensive than the Business Voice bundle.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume upgrading to a higher-tier plan like E3 is the only way to get advanced voice features, overlooking the purpose-built, lower-cost Business Voice add-on for Business license holders.
Detailed technical explanation
How to think about this question
Microsoft 365 Business Voice leverages the same underlying Phone System and Audio Conferencing services as enterprise SKUs but is priced lower for small-to-medium businesses. It includes a Microsoft Calling Plan (domestic or international) or can be used with Operator Connect or Direct Routing for PSTN connectivity. A real-world scenario where this matters is a company with 100 users needing both inbound dial-in for meetings and outbound PSTN calling; Business Voice provides a single SKU that covers both, whereas separate add-ons would require two distinct license assignments per user.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this MS-900 question test?
Describe Microsoft 365 pricing and support — This question tests Describe Microsoft 365 pricing 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 Microsoft 365 Business Voice add-on for each user. — Option B is correct because Microsoft 365 Business Voice is a cost-effective add-on specifically designed for Business Basic, Standard, or Premium subscribers to add Phone System and Audio Conferencing capabilities. It bundles both PSTN calling and dial-in features into a single license, avoiding the higher cost of upgrading to E3 or purchasing separate add-ons.
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This MS-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the MS-900 exam.
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