This MS-900 practice question tests your understanding of describe microsoft 365 apps and services. 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 sales team needs to collaborate on documents in real time, track changes, and co-author using familiar desktop tools. Which Microsoft 365 app should they use?
Microsoft Teams
Why wrong: Teams is a collaboration hub for chat, meetings, and calls, not a document editor.
Microsoft OneNote
Why wrong: OneNote is for digital note-taking, not document co-authoring with track changes.
Microsoft Word
Word supports real-time co-authoring and track changes.
Microsoft Planner
Why wrong: Planner is a task management tool, not for document editing.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Microsoft Word
Microsoft Word is the correct choice because it is the desktop app that natively supports real-time co-authoring, change tracking, and simultaneous editing by multiple users. These features are built into Word for Microsoft 365, allowing teams to collaborate on documents using the familiar desktop interface without needing to switch to a web or mobile app.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Microsoft Teams
Why it's wrong here
Teams is a collaboration hub for chat, meetings, and calls, not a document editor.
Microsoft OneNote
Why it's wrong here
OneNote is for digital note-taking, not document co-authoring with track changes.
Microsoft Word
Why this is correct
Word supports real-time co-authoring and track changes.
Related concept
Read the scenario before looking for a memorised answer.
Microsoft Planner
Why it's wrong here
Planner is a task management tool, not for document editing.
Common exam traps
The trap here is that candidates often confuse Microsoft Teams' file-sharing capability with actual document editing, assuming Teams itself provides co-authoring, when in fact it merely hosts the file and launches Word for editing.
Detailed technical explanation
Real-time co-authoring in Word for Microsoft 365 uses the Office Online Server infrastructure and the Fluid Framework to synchronize edits via WebSocket connections, enabling multiple users to see each other's changes as they type. The Track Changes feature stores revisions as metadata in the document's XML (Office Open XML format), which is preserved even during co-authoring sessions. In a real-world scenario, a sales team can simultaneously edit a proposal in Word, with each member's changes highlighted in a different color, while the document remains locked only at the paragraph level to prevent conflicts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
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FAQ
Describe Microsoft 365 apps and services — This question tests Describe Microsoft 365 apps and services — Read the scenario before looking for a memorised answer..
The correct answer is: Microsoft Word — Microsoft Word is the correct choice because it is the desktop app that natively supports real-time co-authoring, change tracking, and simultaneous editing by multiple users. These features are built into Word for Microsoft 365, allowing teams to collaborate on documents using the familiar desktop interface without needing to switch to a web or mobile app.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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