MS-900 Describe Microsoft 365 apps and services Practice Question
A company uses Microsoft 365 E3. Employees need to co-author Word, Excel, and PowerPoint documents stored in SharePoint Online while working simultaneously. Which Microsoft 365 capability enables this real-time collaboration?
⚠ Common exam trap
Candidates often confuse access control or document recovery features with real-time editing, and selecting version history or group membership thinking that sharing a file is the same as co-authoring it.
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
✓
Microsoft Office co-authoring
Office co-authoring is the native capability that lets several people edit the same Word, Excel, or PowerPoint document stored in SharePoint Online or OneDrive at the same time, merging changes automatically and showing who is working where. Shared mailboxes, version history, and group membership support communication, recovery, and access control respectively, but none of them enable real-time simultaneous editing.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Microsoft 365 Groups membership
Why it's wrong here
Microsoft 365 Groups provide a membership model that connects a team to shared resources such as a mailbox, calendar, SharePoint site, and Planner. Membership determines who can access those resources, but it does not itself provide simultaneous document editing, so it cannot deliver the live co-authoring experience the employees need.
- ✗
Microsoft SharePoint version history
Why it's wrong here
Version history records and restores previous iterations of a document after changes are saved. It is a recovery and audit feature rather than a real-time editing mechanism; users cannot work in the same file simultaneously through version history alone, so it does not satisfy the requirement for live co-authoring across the team.
- ✗
Microsoft Exchange Online shared mailboxes
Why it's wrong here
Shared mailboxes are Exchange Online objects that let a group of users read and send email from a common address. They have no role in document editing or co-authoring, so they cannot enable simultaneous editing of Word, Excel, and PowerPoint files stored in SharePoint Online, making them irrelevant to the stated collaboration requirement.
- ✓
Microsoft Office co-authoring
Why this is correct
Office co-authoring allows multiple users to edit the same Word, Excel, or PowerPoint file stored in SharePoint Online or OneDrive for Business at the same time, with changes merged automatically. It provides presence indicators and live cursors, directly enabling the simultaneous collaboration the employees require while keeping a single authoritative version of the document.
Go deeper
Related to this question
Learn chapter
Exchange Online Architecture and Mail Flow
Key term
SharePoint Online
SharePoint Online is a cloud-based collaboration platform from Microsoft that lets teams create, store, organize, and share content securely from anywhere.
Key term
Microsoft 365
Microsoft 365 is a subscription-based cloud service from Microsoft that combines productivity tools like Office apps with security, device management, and online storage.
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Last reviewed September 2026 · checked against the official Microsoft exam blueprint
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