MS-900 Describe Microsoft 365 apps and services Practice Question
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 team is working on a project proposal that requires simultaneous input from multiple team members. They need to see each other's changes in real time and have a full revision history. Which two Microsoft 365 applications support this capability? (Choose two.)
Word for the web supports real-time co-authoring and version history, enabling multiple contributors to work simultaneously.
B
Excel for the web
Excel for the web also supports real-time co-authoring and version history, ideal for collaborative spreadsheets.
C
Outlook on the web
Why wrong: Outlook on the web is for email, calendar, and tasks; it does not support co-authoring documents.
D
OneNote for Windows 10
Why wrong: While OneNote does support real-time collaboration, the 'OneNote for Windows 10' version is legacy and lacks full version history compared to the modern OneNote app. More importantly, the scenario focuses on document co-authoring, and Word and Excel web are the clearest choices.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Word for the web
Word for the web and Excel for the web support real-time co-authoring, allowing multiple users to edit the same document simultaneously with changes visible to all collaborators within seconds. They also maintain a full revision history via versioning, enabling users to view, restore, or compare previous versions. This capability is built on the Office Online Server infrastructure and uses WebSocket-based synchronization for low-latency updates.
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.
✓
Word for the web
Why this is correct
Word for the web supports real-time co-authoring and version history, enabling multiple contributors to work simultaneously.
Related concept
Read the scenario before looking for a memorised answer.
✓
Excel for the web
Why this is correct
Excel for the web also supports real-time co-authoring and version history, ideal for collaborative spreadsheets.
Related concept
Read the scenario before looking for a memorised answer.
✗
Outlook on the web
Why it's wrong here
Outlook on the web is for email, calendar, and tasks; it does not support co-authoring documents.
✗
OneNote for Windows 10
Why it's wrong here
While OneNote does support real-time collaboration, the 'OneNote for Windows 10' version is legacy and lacks full version history compared to the modern OneNote app. More importantly, the scenario focuses on document co-authoring, and Word and Excel web are the clearest choices.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume Outlook on the web supports real-time collaboration because it is a web app, or that OneNote for Windows 10 has the same co-authoring features as the web version, but Microsoft specifically limits full real-time editing and revision history to the web-based Office apps (Word, Excel, PowerPoint) and not to desktop-only versions or Outlook.
Trap categories for this question
Scenario analysis trap
While OneNote does support real-time collaboration, the 'OneNote for Windows 10' version is legacy and lacks full version history compared to the modern OneNote app. More importantly, the scenario focuses on document co-authoring, and Word and Excel web are the clearest choices.
Detailed technical explanation
How to think about this question
Real-time co-authoring in Word and Excel for the web relies on the Fluid Framework and Operational Transformation (OT) algorithms to merge edits from multiple users without conflicts. The revision history is stored as a series of differential snapshots in SharePoint or OneDrive, allowing granular rollback to any point. In practice, this means teams can collaborate on a proposal without worrying about overwriting each other's work, as the system automatically resolves conflicts and preserves every change.
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 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.
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 apps and services — This question tests Describe Microsoft 365 apps and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Word for the web — Word for the web and Excel for the web support real-time co-authoring, allowing multiple users to edit the same document simultaneously with changes visible to all collaborators within seconds. They also maintain a full revision history via versioning, enabling users to view, restore, or compare previous versions. This capability is built on the Office Online Server infrastructure and uses WebSocket-based synchronization for low-latency updates.
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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