This MS-900 practice question tests your understanding of describe microsoft 365 apps and services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 hospital uses Microsoft 365 and needs to comply with HIPAA by ensuring that patient health information in emails is encrypted both in transit and at rest. Which Microsoft 365 feature should they enable?
Microsoft Defender for Office 365
Why wrong: This provides threat protection, not encryption.
Microsoft Intune
Why wrong: Intune is for mobile device management, not email encryption.
Microsoft Purview Data Lifecycle Management
Why wrong: This manages data retention and deletion, not encryption.
Office 365 Message Encryption
This encrypts emails both in transit and at rest.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Office 365 Message Encryption
Office 365 Message Encryption (OME) is the correct feature because it provides built-in encryption for emails both in transit (via TLS) and at rest (via Azure Rights Management), ensuring that patient health information (PHI) remains protected and compliant with HIPAA requirements. OME integrates with Azure Information Protection to apply persistent encryption that travels with the email, regardless of where it is stored.
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.
Microsoft Defender for Office 365
Why it's wrong here
This provides threat protection, not encryption.
Microsoft Intune
Why it's wrong here
Intune is for mobile device management, not email encryption.
Microsoft Purview Data Lifecycle Management
Why it's wrong here
This manages data retention and deletion, not encryption.
Office 365 Message Encryption
Why this is correct
This encrypts emails both in transit and at rest.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse Microsoft Defender for Office 365 (a threat protection tool) with email encryption, because both are security-related, but Defender does not provide the persistent encryption required for HIPAA compliance.
Detailed technical explanation
Office 365 Message Encryption leverages Azure Rights Management (Azure RMS) to apply encryption policies that persist even after the email is delivered, using a combination of S/MIME and TLS for transport encryption and AES-256 for at-rest encryption. A subtle behavior is that OME can be configured to require recipients to authenticate via a Microsoft account or a one-time passcode to view encrypted messages, which adds an extra layer of access control beyond simple encryption. In a real-world hospital scenario, OME ensures that if an email containing PHI is forwarded to an external party, the encryption remains intact, preventing unauthorized access.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
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FAQ
Describe Microsoft 365 apps and services — This question tests Describe Microsoft 365 apps and services — Read the scenario before looking for a memorised answer..
The correct answer is: Office 365 Message Encryption — Office 365 Message Encryption (OME) is the correct feature because it provides built-in encryption for emails both in transit (via TLS) and at rest (via Azure Rights Management), ensuring that patient health information (PHI) remains protected and compliant with HIPAA requirements. OME integrates with Azure Information Protection to apply persistent encryption that travels with the email, regardless of where it is stored.
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 24, 2026
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