AB-900 practice question 6 of 35

What does a retention policy in Exchange Online do?

Choose your answer, then check it against the explanation and the full breakdown below.

What does a retention policy in Exchange Online do?

Answer options

Correct Answer:

B

Explanation

A retention policy in Exchange Online, as part of Microsoft Purview Data Lifecycle Management, defines the rules for how long email messages and other content are kept (retained) and what happens to them after that period expires. Administrators can configure policies to retain content for a specific duration to meet compliance or business requirements, and then either automatically delete it, archive it, or do nothing. This ensures that data is managed throughout its lifecycle, balancing business value with risk mitigation.

Why Incorrect

A. Deletes all emails immediately upon receipt: This is incorrect. Retention policies specify a duration for keeping items, not immediate deletion.

C. Blocks all incoming mail from external domains: This is the function of mail flow rules (transport rules) or anti-spam policies, not retention policies.

D. Forwards every message to an external archive system: This functionality is typically handled by journaling rules or mail flow rules, not retention policies.

References

1. Microsoft Learn. (2024). Learn about retention policies & retention labels. Microsoft Docs. Retrieved from https://learn.microsoft.com/en-us/purview/retention. See the "What are retention policies and retention labels?" section

which states

"Use retention policies and retention labels to manage the data for your organization."

2. Microsoft Learn. (2024). Retention policy and retention label actions. Microsoft Docs. Retrieved from https://learn.microsoft.com/en-us/purview/retention-actions. See the section "Comparing what retention policies and retention labels can do

" which details actions like "Retain content" and "Delete content."

Question 6 of 35

Question breakdown

Tests: Describe data lifecycle management with Microsoft Purview retention
Difficulty: Easy

Key idea: A retention policy sets how long content is kept and what happens when that period ends: delete it, archive it, or take no action.

How to reach the answer

The question asks what a retention policy does, so focus on time-based lifecycle control.
Retention means keeping content for a defined period to meet compliance or business needs.
When that period ends, the policy can delete the content, move it to an archive, or do nothing.
Only option B describes a retention period followed by delete or archive.

Each option

AIncorrect. Retention policies keep content for a set period; they do not delete mail the moment it arrives.
BCorrect. It describes the core purpose: define a retention period, then delete or archive the content.
CIncorrect. Blocking external senders is handled by mail flow rules or anti-spam and connection filtering, not retention.
DIncorrect. Copying messages to an external system is journaling, not retention.

Common trap: Option D can look right because archiving and retention are both compliance topics, but sending copies to an external archive is journaling, not a retention policy.

In practice: Compliance teams use retention policies to keep mail for a fixed number of years for legal requirements. The same policies remove stale data so it doesn't add risk.

Remember: Retention equals how long to keep content plus what to do afterward, such as delete or archive.

Official documentation: Learn about retention policies and retention labels

Drafted with AI assistance and checked against the answer key.

Keep practicing

Take the free AB-900 practice test

Ten exam-style questions with answers and explanations, plus the exam facts and study guides.

Start the free practice test

More questions

Other AB-900 practice questions