Quick Answer
The answer is Software as a Service (SaaS), because moving email to Microsoft 365 is a classic SaaS example where Microsoft delivers the entire Exchange Online application as a fully managed service. In this model, the customer simply accesses the software through a web browser or email client, while Microsoft handles all underlying infrastructure, operating systems, and middleware. On the Microsoft Azure Fundamentals AZ-900 exam, this scenario tests your ability to distinguish SaaS from IaaS or PaaS—a common trap is confusing SaaS with PaaS, but remember that SaaS provides ready-to-use software like email, whereas PaaS provides a platform for building applications. A helpful memory tip: think of SaaS as “software you just sign in to use,” like Microsoft 365, where you never see the server or manage updates.
This AZ-900 practice question tests your understanding of describe cloud concepts. 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 company decides to move its email to Microsoft 365. What cloud service model is this an example of?
IaaS
Why wrong: IaaS would mean they manage their own Exchange Server on cloud-provided VMs.
PaaS
Why wrong: PaaS would mean they deploy their own email application on a managed platform.
SaaS
Microsoft 365 email is SaaS — Microsoft manages everything; users access the fully managed email application.
On-premises
Why wrong: On-premises means running on their own hardware; Microsoft 365 is a cloud SaaS service.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
SaaS
Moving email to Microsoft 365 is an example of Software as a Service (SaaS) because Microsoft provides the entire email application (Exchange Online) as a fully managed service. The customer accesses the software via a web browser or email client without managing the underlying infrastructure, operating system, or middleware.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
IaaS
Why it's wrong here
IaaS would mean they manage their own Exchange Server on cloud-provided VMs.
PaaS
Why it's wrong here
PaaS would mean they deploy their own email application on a managed platform.
SaaS
Why this is correct
Microsoft 365 email is SaaS — Microsoft manages everything; users access the fully managed email application.
Related concept
Read the scenario before looking for a memorised answer.
On-premises
Why it's wrong here
On-premises means running on their own hardware; Microsoft 365 is a cloud SaaS service.
Common exam traps
The trap here is that candidates often confuse PaaS with SaaS because both are cloud services, but PaaS is for building and deploying custom applications, whereas SaaS delivers a fully functional application like email.
Detailed technical explanation
In SaaS, the provider manages the entire stack, including the application, runtime, middleware, OS, and hardware. For Microsoft 365, Exchange Online uses protocols like MAPI over HTTP, SMTP, and IMAP, and the customer only configures user mailboxes and policies via the Exchange Admin Center. A subtle behavior is that even though the customer doesn't manage the infrastructure, they still have administrative control over features like retention policies and anti-spam settings.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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FAQ
Describe cloud concepts — This question tests Describe cloud concepts — Read the scenario before looking for a memorised answer..
The correct answer is: SaaS — Moving email to Microsoft 365 is an example of Software as a Service (SaaS) because Microsoft provides the entire email application (Exchange Online) as a fully managed service. The customer accesses the software via a web browser or email client without managing the underlying infrastructure, operating system, or middleware.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This AZ-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 AZ-900 exam.
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