MS-900 Describe cloud concepts Practice Question
A help desk lead is documenting the correct Microsoft 365 approach to 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 requires you to manage the application code and runtime, whereas SaaS delivers a fully finished application like Exchange Online, eliminating all server management tasks.
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's Exchange Online delivers hosted email as a Software as a Service (SaaS) offering. This means Microsoft manages the mail servers, software updates, and infrastructure, while the help desk lead simply configures user mailboxes and policies via the admin center. SaaS is the cloud model where the provider hosts and manages the entire application, aligning perfectly with the requirement to avoid managing mail servers.
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
PaaS provides managed runtimes and middleware for deploying custom applications, not a finished hosted email service, so the help desk would still build and run the mail platform. It tempts because PaaS removes server management generally, and it would be correct for hosting a bespoke web app.
- ✗
Community cloud
Why it's wrong here
Community cloud pools infrastructure among organisations sharing concerns such as compliance or mission, so it cannot deliver Microsoft 365 hosted email to a single help desk. It tempts because shared-sector hosting genuinely suits consortiums of banks or government bodies, but the requirement here is a public multi-tenant service.
- ✓
Software as a Service (SaaS)
Why this is correct
SaaS delivers fully hosted applications where the provider manages servers, patching and availability. Microsoft 365 email is consumed directly, so the help desk needs no mail server administration. This matches the requirement of hosted email without managing infrastructure.
- ✗
Infrastructure as a Service (IaaS)
Why it's wrong here
IaaS supplies raw virtual machines, storage and networking, leaving the guest operating system, mail server software and patching to the customer, so mail servers are still managed. It tempts because IaaS does host workloads, and it would be correct when full control of the server stack is required.
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Related to this question
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Windows 365 Cloud PC
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.
Key term
User
A user is any person, system, or device that interacts with an IT service, resource, or identity system, typically authenticated through credentials and authorized to perform specific actions.
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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.