Manage audit log retention policies (2024)

You can create and manage audit log retention policies in the Microsoft Purview portal or the Microsoft Purview compliance portal. Audit log retention policies are part of the new Microsoft Purview Audit (Premium) capabilities. An audit log retention policy lets you specify how long to retain audit logs in your organization. You can retain audit logs for up to 10 years. You can create policies based on the following criteria:

• All activities in one or more Microsoft services
• Specific activities in a Microsoft service performed by all users or by specific users
• A priority level that specifies which policy takes precedence in you have multiple policies in your organization

Default audit log retention policy

Audit (Premium) in Microsoft Purview provides a default audit log retention policy for all organizations. This policy can't be modified and retains all Exchange Online, SharePoint, OneDrive, and Microsoft Entra audit records for one year. This default policy retains audit records that contain the value of AzureActiveDirectory, Exchange, OneDrive, and SharePoint for the Workload property (which is the service in which the activity occurred). Specific workloads and record types can be changed to a different duration using a retention policy. See the Default retention policy record types section in this article for a list of record types for each workload that are included in the default policy.

Before you create an audit log retention policy

• You have to be assigned the Organization Configuration role in the Microsoft Purview portal or the compliance portal to create or modify an audit retention policy.

• You can have a maximum of 50 audit log retention policies in your organization.

• To retain an audit log for longer than 180 days (and up to 1 year), the user who generates the audit log (by performing an audited activity) must be assigned an Office 365 E5 or Microsoft 365 E5 license or have a Microsoft 365 E5 Compliance or E5 eDiscovery and Audit add-on license. To retain audit logs for 10 years, the user who generates the audit log must also be assigned a 10-year audit log retention add-on license in addition to an E5 license.

  Note

  If the user generating the audit log doesn't meet these licensing requirements, data is retained according to the highest priority retention policy. This may be either the default retention policy for the user's license or the highest priority policy that matches the user and its record type.

  See Also

  How Audit Logs Improve Security and Compliance - TitanFileWhy Audit Logs Are ImportantGuidelines for Developing Your Data Retention Policy1191 Retention Policies and Procedures

• All custom audit log retention policies (created by your organization) take priority over the default retention policy. For example, if you create an audit log retention policy for Exchange mailbox activity that has a retention period that's shorter than one year, audit records for Exchange mailbox activities will be retained for the shorter duration specified by the custom policy.

• The audit item lifetime for data is determined when it's added to the auditing pipeline and is based on the licensing defaults or applicable retention policies. Any changes to licensing or applicable retention policies change the expiration time of the audit data after updating. These changes don't update any previously committed items.

Create an audit log retention policy

Select the appropriate tab for the portal you're using. To learn more about the Microsoft Purview portal, see Microsoft Purview portal. To learn more about the Compliance portal, see Microsoft Purview compliance portal.

Manage audit log retention policies in the compliance portal

Audit log retention policies are listed on the Audit retention policies tab (also called the dashboard). You can use the dashboard to view, edit, and delete audit retention policies.

View policies in the dashboard

Audit log retention policies are listed in the dashboard. One advantage of viewing policies in the dashboard is that you can select the Priority column to list the policies in the priority in which they're applied. As previously explained, a lower value indicates a higher priority.

You can also select a policy to display its settings on the flyout page.

Edit policies in the dashboard

To edit a policy, select it to display the flyout page. You can modify one or more setting and then save your changes.

Delete policies in the dashboard

To delete a policy, select the Delete icon and then confirm that you want to delete the policy. The policy is removed from the dashboard, but it might take up to 30 minutes for the policy to be removed from your organization.

Create and manage audit log retention policies in PowerShell

You can also use Security & Compliance PowerShell to create and manage audit log retention policies. One reason to use PowerShell is to create a policy for a record type or activity that isn't available in the UI.

Create an audit log retention policy in PowerShell

Follow these steps to create an audit log retention policy in PowerShell:

1. .

2. Run the following command to create an audit log retention policy:

   New-UnifiedAuditLogRetentionPolicy -Name "Microsoft Teams Audit Policy" -Description "One year retention policy for all Microsoft Teams activities" -RecordTypes MicrosoftTeams -RetentionDuration TenYears -Priority 100

   This example creates an audit log retention policy named "Microsoft Teams Audit Policy" with these settings:

   • A description of the policy.
   • Retains all Microsoft Teams activities (as defined by the RecordType parameter).
   • Retains Microsoft Teams audit logs for 10 years.
   • A priority of 100.

Here's another example of creating an audit log retention policy. This policy retains audit logs for the "User logged in" activity for six months for the user admin@contoso.onmicrosoft.com.

New-UnifiedAuditLogRetentionPolicy -Name "SixMonth retention for admin logons" -RecordTypes AzureActiveDirectoryStsLogon -Operations UserLoggedIn -UserIds admin@contoso.onmicrosoft.com -RetentionDuration SixMonths -Priority 25

For more information, see New-UnifiedAuditLogRetentionPolicy.

View policies in PowerShell

Use the Get-UnifiedAuditLogRetentionPolicy cmdlet in Security & Compliance PowerShell to view audit log retention policies.

Here's a sample command to display the settings for all audit log retention policies in your organization. This command sorts the policies from the highest to lowest priority.

Get-UnifiedAuditLogRetentionPolicy | Sort-Object -Property Priority -Descending | FL Priority,Name,Description,RecordTypes,Operations,UserIds,RetentionDuration

Edit policies in PowerShell

Use the Set-UnifiedAuditLogRetentionPolicy cmdlet in Security & Compliance PowerShell to edit an existing audit log retention policy.

Delete policies in PowerShell

Use the Remove-UnifiedAuditLogRetentionPolicy cmdlet in Security & Compliance PowerShell to delete an audit log retention policy. It might take up to 30 minutes for the policy to be removed from your organization.

Default retention policy record types

Audit records for operations in Microsoft Entra ID, Exchange Online, SharePoint, and OneDrive, are retained for one year by default. This means that audit logs for any operation with this workload are retained for one year unless a custom audit log retention policy takes precedence for a specific record type, operation, or user.