MS-900 Describe cloud concepts Practice Question
A business stakeholder asks how Microsoft 365 can help them use hosted email without managing mail servers. Cloud concept or benefit best matches this requirement?
⚠ Common exam trap
Watch out — candidates often confuse PaaS with SaaS because both involve managed services, but PaaS still requires the customer to deploy and manage the application code (e.g., a custom email server), whereas SaaS delivers the fully functional application itself.
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
✓
Software as a Service (SaaS)
Microsoft 365 delivers hosted email (Exchange Online) as a Software as a Service (SaaS) offering, where Microsoft manages the mail servers, patches, and infrastructure. The stakeholder simply uses the service via a web browser or client without any server administration. This aligns with the SaaS model, which provides ready-to-use applications over the internet.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Platform as a Service (PaaS)
Why it's wrong here
Platform as a Service (PaaS) is a cloud service model that provides a managed development and deployment environment—including runtime, middleware, and tools—for building custom applications. Microsoft 365, however, is not a platform for writing code; it ships finished products like Exchange Online, SharePoint, and Teams. A stakeholder who wants to simply use these services has no need for PaaS, which would require them to develop and manage their own application code on top of a platform.
- ✗
Community cloud
Why it's wrong here
Community cloud is a deployment model where the cloud infrastructure is shared by several organizations from a specific community with common compliance or security needs. It does not describe how Microsoft 365 delivers its applications; Microsoft 365 is a public SaaS offering with strict multi-tenant isolation rather than a community-based deployment. Thus, it cannot be the correct classification for a stakeholder wanting to use Microsoft 365's business productivity tools.
- ✓
Software as a Service (SaaS)
Why this is correct
Software as a Service (SaaS) is a cloud service model where the provider operates the complete application, including the underlying infrastructure, platform, and application code, and delivers it to users over the internet. Microsoft 365 exemplifies SaaS with services such as Exchange Online, Microsoft Teams, and Word Web App, which Microsoft patches and updates centrally. This matches the stakeholder's goal of using business tools immediately without managing servers or software installations, making it the correct answer.
- ✗
Infrastructure as a Service (IaaS)
Why it's wrong here
Infrastructure as a Service (IaaS) offers virtualized computing resources like virtual machines, storage, and networking, and the customer must configure, harden, and maintain the operating system and applications. Microsoft 365 does not expose virtual infrastructure; instead, Microsoft manages the entire stack of its productivity applications. Selecting IaaS would create an unrealistic expectation of administrative control and server-level responsibility that is not part of a Microsoft 365 adoption.
Go deeper
Related to this question
Learn chapter
Exchange Online Architecture and Mail Flow
Key term
Exchange Online
Exchange Online is Microsoft's cloud-based email, calendar, and contact hosting service that is part of the Microsoft 365 suite, allowing organizations to manage corporate messaging without maintaining their own mail servers.
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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Written by Johnson Ajibi, MSc IT Security
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