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. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 50 users with Microsoft 365 Business Basic licenses. They want to allow dial-in access to their online meetings for participants who cannot use VoIP. They need to minimize additional licensing costs. What should they purchase?
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.
Correct. Audio Conferencing enables participants to dial into meetings using a phone number, which is exactly what the company needs.
B
Phone System add-on
Why wrong: Incorrect. Phone System allows users to make and receive phone calls using Microsoft Teams, but does not provide dial-in access for meetings.
C
Microsoft 365 Business Voice
Why wrong: Incorrect. Business Voice includes Phone System and Audio Conferencing, but it is more expensive than purchasing Audio Conferencing alone.
D
Upgrade to Microsoft 365 Business Standard
Why wrong: Incorrect. Upgrading to Business Standard provides desktop versions of Office apps but does not include Audio Conferencing.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Audio Conferencing add-on
Audio Conferencing is the correct add-on because it provides dial-in (PSTN) access to Microsoft Teams meetings, allowing participants to join via phone when VoIP is unavailable. Since the company already has Microsoft 365 Business Basic licenses, which include Teams but not dial-in capabilities, purchasing the Audio Conferencing add-on per user is the most cost-effective way to enable this feature without upgrading the entire license.
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.
✓
Audio Conferencing add-on
Why this is correct
Correct. Audio Conferencing enables participants to dial into meetings using a phone number, which is exactly what the company needs.
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.
✗
Phone System add-on
Why it's wrong here
Incorrect. Phone System allows users to make and receive phone calls using Microsoft Teams, but does not provide dial-in access for meetings.
✗
Microsoft 365 Business Voice
Why it's wrong here
Incorrect. Business Voice includes Phone System and Audio Conferencing, but it is more expensive than purchasing Audio Conferencing alone.
✗
Upgrade to Microsoft 365 Business Standard
Why it's wrong here
Incorrect. Upgrading to Business Standard provides desktop versions of Office apps but does not include Audio Conferencing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the Phone System add-on (which handles internal call routing) with Audio Conferencing (which provides external dial-in to meetings), leading them to pick the wrong add-on for PSTN meeting access.
Detailed technical explanation
How to think about this question
Audio Conferencing uses the Microsoft PSTN network to bridge VoIP and phone participants into a single meeting via a conference bridge. Each licensed user gets a dedicated dial-in number (or can share a bridge), and participants dial a toll or toll-free number with a conference ID. Under the hood, this leverages Session Border Controllers (SBCs) and the Microsoft Teams Direct Routing infrastructure to handle media transcoding between SIP and PSTN codecs like G.711 and SILK.
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 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: Audio Conferencing add-on — Audio Conferencing is the correct add-on because it provides dial-in (PSTN) access to Microsoft Teams meetings, allowing participants to join via phone when VoIP is unavailable. Since the company already has Microsoft 365 Business Basic licenses, which include Teams but not dial-in capabilities, purchasing the Audio Conferencing add-on per user is the most cost-effective way to enable this feature without upgrading the entire license.
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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