MS-900 Describe cloud concepts Practice Question
A company wants to provide its employees with access to email, calendar, and document editing tools through a web browser without installing any software. The provider manages all maintenance, updates, and security of the applications. Which cloud service model best describes this scenario?
⚠ Common exam trap
Many candidates confuse SaaS with PaaS because both involve managed services, but PaaS is for developers building custom applications, not for end users consuming ready-made applications like email and calendars.
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)
This scenario describes Software as a Service (SaaS) because the provider delivers fully functional applications—such as email, calendar, and document editing—over the web, with no local installation required. The provider handles all maintenance, updates, and security, which is the defining characteristic of SaaS. Examples include Microsoft 365 (Exchange Online, Outlook, Word Online) and Google Workspace.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Infrastructure as a Service (IaaS)
Why it's wrong here
IaaS (Infrastructure as a Service) is wrong because it only supplies virtualized hardware — compute, storage, and networking — leaving the customer fully responsible for configuring, patching, and managing the OS, middleware, and any applications installed on top. In this scenario, employees need immediate, ready-to-use email, calendar, and document tools, which are end-user applications, not infrastructure components. Buying IaaS would mean the organization must purchase, deploy, and maintain its own email and office software, far exceeding the simple goal of providing access.
- ✗
Platform as a Service (PaaS)
Why it's wrong here
PaaS (Platform as a Service) is incorrect because it offers a managed cloud environment for developing, testing, and deploying custom applications, including runtimes, databases, and dev tools. It does not deliver packaged, off-the-shelf productivity applications to end users — there is no built-in email client or document editor that employees can simply open in a browser. The scenario asks for turnkey services like email and document processing, not a platform to code and host them, so PaaS is the wrong service model.
- ✓
Software as a Service (SaaS)
Why this is correct
SaaS (Software as a Service) is correct because it delivers fully functional, ready-to-use applications over the internet, with the provider managing all underlying infrastructure, platform, and application code. Email, shared calendars, and document editing are classic SaaS workloads — think of Microsoft 365 Exchange Online, Outlook on the web, and Office for the web. Users only need a browser or thin client, never having to worry about servers, patching, or maintenance, which perfectly matches the need to provide employees with access to these applications.
- ✗
Desktop as a Service (DaaS)
Why it's wrong here
DaaS (Desktop as a Service) is not the correct choice because it primarily delivers virtualized desktops and full Windows sessions, not individual productivity applications as standalone services. While a DaaS environment could include email and document apps, the core offering is a complete managed desktop OS, which is overkill for the stated need of providing only email, calendar, and document access. The scenario does not mention virtual desktops or a full desktop experience, so the more direct and appropriate model is SaaS.
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Related to this question
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Cloud Service Types for MS-900
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
Outlook
Microsoft Outlook is an email, calendar, and contact management application that is part of the Microsoft 365 suite, used by businesses and individuals to organize communications and schedules.
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Same concept, more angles
1 more way this is tested on MS-900
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A user wants to access company email and documents from any device, anywhere. Which cloud model is Microsoft 365?
easy- A.Platform as a Service (PaaS)
- ✓ B.Software as a Service (SaaS)
- C.Infrastructure as a Service (IaaS)
- D.Desktop as a Service (DaaS)
Why B: Microsoft 365 is a Software as a Service (SaaS) offering where users subscribe to cloud-based applications like Exchange Online and SharePoint Online, accessible from any device. Option B (SaaS) is correct. Option A (PaaS) provides development platforms. Option C (IaaS) provides infrastructure like VMs. Option D (DaaS) provides virtual desktops.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This MS-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the MS-900 exam.