Compliance Problems

Microsoft Purview eDiscovery Licensing Requirements for Mailboxes

Maira Mehtab Sep 20, 2026 869 views

Question details

The user is asking whether a single Microsoft Purview license for an administrator allows them to analyze all company mailboxes using eDiscovery, or if each individual target mailbox requires its own license.

Product: Microsoft Purview
Device & OS: not provided
Scenario: Using the eDiscovery function in Microsoft Purview to analyze company-wide mailboxes.
Observed behavior: The user is seeking clarification on Microsoft's compliance licensing model for target mailboxes being analyzed during eDiscovery.

Before you start

Ensure you have access to the Microsoft 365 Admin Center with Billing Administrator or Global Administrator privileges to review current subscriptions and assign user licenses.

Solution 1Recommended

Verify and Assign Required Licenses to Target Mailboxes

An administrator's license alone does not cover the entire organization for eDiscovery. You must license the individual mailboxes being analyzed.

Microsoft's compliance licensing model dictates that the data being governed or analyzed—in this case, the target mailbox—must hold the appropriate license, rather than just the administrator performing the search. For Microsoft Purview eDiscovery (Standard or Premium), each user whose mailbox is placed on hold or searched must have a valid compliance license assigned to their account.

Review eDiscovery license requirements

Check the official Microsoft 365 licensing guidance to determine if your organization requires eDiscovery Standard (usually included in E3) or eDiscovery Premium (requires E5 or specific compliance add-ons) based on your analysis needs.

Access the Microsoft 365 Admin Center

Log in to the Microsoft 365 admin portal at admin.microsoft.com and navigate to the 'Billing' section, then click on 'Licenses' to view your organization's available subscriptions.

Assign licenses to target users

Select 'Users' > 'Active users', choose the users whose mailboxes need to be analyzed in eDiscovery, click 'Licenses and apps', and assign the required Microsoft 365 or Purview compliance licenses.

Verify auditing and permissions

Ensure mailbox auditing is turned on for the target mailboxes, and verify that the administrator running the search has been assigned the 'eDiscovery Manager' or 'eDiscovery Administrator' role in the Purview compliance portal.

Shared Mailbox Licensing: Shared mailboxes generally do not require a separate license for basic eDiscovery searches. However, if the shared mailbox is placed on Litigation Hold or requires advanced eDiscovery Premium features, it must be assigned an Exchange Online Plan 2 license.

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Frequently Asked Questions

What happens if I search an unlicensed mailbox in Microsoft Purview eDiscovery?

Running eDiscovery searches on unlicensed mailboxes violates Microsoft's licensing terms of service. While technical enforcement may vary, your organization risks compliance penalties during software licensing audits.

Does the eDiscovery Administrator need a specific Purview license?

The administrator must have the appropriate role-based permissions assigned in the Purview compliance portal. However, the core compliance licensing requirement applies to the users (mailboxes) being governed, managed, or placed on hold, rather than the admin executing the search.

Can I use eDiscovery on mailboxes with basic Exchange Online Plan 1 licenses?

Exchange Online Plan 1 includes basic eDiscovery capabilities. However, if you need to place a mailbox on Litigation Hold or use eDiscovery Premium features, the mailbox must be upgraded to an Exchange Online Plan 2 license or an equivalent E3/E5 subscription.

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