Microsoft Purview: eDiscovery (Premium) – Review set per case limit increase

Introduction

We’re increasing the maximum number of review sets per case in Microsoft Purview eDiscovery (Premium) from 20 to 100. A review set is a set of documents where you can analyze, query, view, tag, and export data. This update is based on customer feedback from organizations running large or complex investigations and improves scalability for eDiscovery (Premium) workflows.

This message is associated with Microsoft 365 Roadmap ID 558858.

When this will happen:

• General Availability (Worldwide) We will begin rolling out mid-April 2026 and expect to complete by early May 2026.

How this affects your organization:

Who is affected:

• Admins, investigators, and reviewers using Microsoft Purview eDiscovery (Premium)
• You are receiving this message because our reporting indicates one or more users in your organization may be using Microsoft Purview eDiscovery (Premium).

What will happen:

• eDiscovery (Premium) cases can now contain up to 100 review sets per case (previously limited to 20).
• Applies to both new and existing cases.
• Cases that previously reached the 20‑review‑set limit can now create additional review sets.
• A warning banner appears when a case is close to reaching 100 review sets.
• Creation of additional review sets per case is blocked beyond 100.
• Existing review sets and their contents are not changed or affected.
• The increase is enabled by default and requires no configuration changes.

What you can do to prepare:

No action is required.

• Inform investigators of the new 100‑review‑set per case limit.
• Update internal documentation referencing the previous limit.

Learn more about eDiscovery (Premium) review sets | Microsoft Learn

Compliance considerations: