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Microsoft 365 E5 Compliance Add-On — Adding Advanced eDiscovery and 7-Year Retention to E3
A company with 500 users is currently licensed with Microsoft 365 E3. The compliance team needs to add advanced eDiscovery capabilities (including predictive coding and legal hold) and the ability to retain data for up to 7 years. What is the most cost-effective licensing addition?
Quick Answer
The Microsoft 365 E5 Compliance add-on is the most cost-effective licensing change because it delivers exactly the two capabilities the compliance team needs on top of an existing E3 base — advanced eDiscovery with predictive coding and legal hold, and retention policies extending data preservation up to seven years — without the expense of upgrading every seat to full E5. Predictive coding is a specific eDiscovery Premium capability that uses machine learning to prioritise and surface the most relevant documents in a large review set, which is not available under E3's more limited eDiscovery Standard tooling. Purchasing the Compliance add-on for the 500 existing E3 users adds this capability precisely where it is needed while leaving the rest of each user's licensing unchanged, which is why it beats a full E5 upgrade on cost when the requirement is scoped narrowly to compliance features. The pattern across these scenarios rewards matching the add-on to the specific capability gap rather than defaulting to the broadest available upgrade.
⚠ Common exam trap
Test-takers frequently confuse the E5 Compliance add-on with the full E5 suite, assuming they need to upgrade the entire license when a targeted add-on is sufficient and more cost-effective.
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
✓
Microsoft 365 E5 Compliance add-on
The Microsoft 365 E5 Compliance add-on provides advanced eDiscovery capabilities (including predictive coding and legal hold) and the ability to retain data for up to 7 years via retention policies. This add-on is the most cost-effective way to add these specific compliance features to an existing Microsoft 365 E3 subscription, as it avoids the higher cost of upgrading the entire suite to E5.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Microsoft 365 E5 Compliance add-on
Why this is correct
This add-on includes advanced eDiscovery and retention features, specifically designed to meet compliance needs without the full E5 suite.
- ✗
Microsoft 365 E5 Security add-on
Why it's wrong here
The Security add-on focuses on advanced threat protection and endpoint security, not eDiscovery or retention.
- ✗
Microsoft 365 E5
Why it's wrong here
While E5 includes both Compliance and Security features, it is more expensive than the Compliance add-on alone and includes unnecessary security features.
- ✗
Office 365 E5
Why it's wrong here
Office 365 E5 includes some compliance capabilities but does not include the full Microsoft 365 E5 Compliance add-on features like advanced eDiscovery.
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Benefits of Microsoft Cloud
Key term
Subscription
A subscription is a payment model where you pay a recurring fee to access a product or service instead of buying it once and owning it forever.
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.
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Same concept, more angles
2 more ways this is tested on MS-900
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Variation 1. A company has 500 users with Microsoft 365 E3 licenses. They need to add Communication Compliance and Insider Risk Management for all users. They want to minimize additional costs while retaining their existing E3 subscriptions. What is the most cost-effective licensing approach?
medium- A.Upgrade all users to Microsoft 365 E5
- ✓ B.Purchase the Microsoft 365 E5 Compliance add-on for all users
- C.Purchase the Microsoft 365 E5 eDiscovery and Audit add-on
- D.Replace E3 with Microsoft 365 Business Premium
Why B: Microsoft 365 E5 Compliance is an add-on license for E3 that provides Communication Compliance, Insider Risk Management, and other advanced compliance features. Upgrading all users to E5 is more expensive if the advanced security features of E5 are not needed. The E5 eDiscovery and Audit add-on does not include Communication Compliance or Insider Risk Management. Business Premium plans are not compatible with enterprise E3 subscriptions and lack these features.
Variation 2. A company currently has Microsoft 365 E3 licenses for all users. They need to retain all Exchange Online mailbox data for 10 years and place legal holds for litigation. Which add-on license provides these retention and eDiscovery capabilities?
easy- ✓ A.Microsoft 365 E5 Compliance
- B.Microsoft 365 E5 Security
- C.Microsoft 365 E5
- D.Office 365 E5
Why A: Microsoft 365 E5 Compliance is the correct add-on because it includes advanced eDiscovery (e.g., eDiscovery Premium) and retention capabilities such as Preservation Lock and 10-year retention policies via Microsoft Purview. The base E3 license only provides basic retention and eDiscovery, lacking the extended 10-year retention and litigation hold features required for this scenario.
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.