Copilot Meets Compliance: Copilot’s Role in Retention, Audit, and e-Discovery

Introduction

Microsoft 365 Copilot is transforming productivity by embedding AI into apps like Word, Excel, Outlook, and Teams. with this innovation comes the responsibility to ensure compliance, security, and governance. This blog explains what Copilot experience contains, how to configure retention policies, audit logs, and eDiscovery.

Human AI prompts and responses often include sensitive or regulated information. Organizations must be able to retain, search, and preserve this data to meet compliance and legal requirements. Microsoft Purview enables these capabilities across Copilot and other AI solutions integrated with Microsoft 365.

When users interact with Microsoft 365 Copilot or Copilot for Sales or Security Copilot, their prompts and responses are saved in Exchange Online mailboxes. The data is stored in a hidden folder within the mailbox and treated like other communications data for compliance.

Because the data is stored in mailboxes, it follows the same compliance model as email and Teams chats. That consistency makes it easier for security and compliance teams to apply familiar processes to AI interactions.

This design means AI interactions can be:

• Searched with content search or eDiscovery
• Managed with retention policies through Data Lifecycle Management
• Audited activity with Microsoft Purview Audit

✅ What Does Copilot Experience Contain?

Copilot interactions include:

• User prompts: Text typed by users or prepopulated AI prompts.
• AI responses: Generated text, links, summaries, and references.

The following Copilot tools are included within Copilot Experince:

• Microsoft 365 Copilot
• Security Copilot
• Copilot in Fabric
• Copilot Studio

⚠️ Important: Although Copilot interactions are stored in hidden folders within Exchange Online mailboxes, Exchange retention policies do NOT apply. You must configure Microsoft Purview retention policies specifically for Copilot interactions.

In just 4 minutes, this recap video walks you through setting up Retention Policies, Audit, and eDiscovery

✅ Step 1: Configure Retention Policy for Microsoft Copilot Experiences

Retention policies help determine how long prompts and responses remain accessible. Consider a scenario where your legal team needs access to Copilot interactions from 9 months ago. Without retention policies, that data could be gone.

With Microsoft Purview retention policies, you can:

• Automatically apply retention policies to Copilot Experience
• Use adaptive or static scopes to target specific users or groups
• Ensure content is retained for legal or compliance needs, even if a user deletes it

The retention policy applies to Microsoft 365 Copilot interactions, the following licenses provide user rights:

• Microsoft 365 E3/E5 + Microsoft 365 Copilot
• Microsoft 365 E3 + Microsoft Purview Suite + Microsoft 365 Copilot
• Microsoft 365 E3 + Microsoft E5 Information Protection and Governance + Microsoft 365 Copilot

Lets setup the retetnion policy:

1. Sign in to https://purview.microsoft.com.
2. Navigate to Data Lifecycle Management > Retention Policies.
3. Click Create retention policy.
4. Name your policy (e.g., “Copilot Interaction Retention”).
5. Under Choose locations, select:
   • Microsoft Copilot Experinces.
6. Define retention settings:
   • Retain-only, Delete-only, or Retain and then delete based on your compliance requeriment.
7. Apply, review and publish the policy.

✅ Step 2: Configure the retention policy for audit logging and create an audit log for Copilot interactions.

When auditing Copilot interactions, Microsoft Purview Audit captures metadata in JSON format, including details such as the client type, user, timestamp, and accessed resources. However, it does not capture the actual user prompts or Copilot responses.

You confirm that auditing is enabled. By default, it should be turned on, but you can verify this using the following command

Get-AdminAuditLogConfig | Format-List UnifiedAuditLogIngestionEnabled

To configure Retetnion policy for Audit you need for example E5 license more info see:
Audit (Standard) is included in:

• Microsoft 365: E3, E5, F1, F3
• Office 365: E1, E3, E5, F3

Audit (Premium) requires:

• Microsoft 365: E5, E5 Compliance, F5 Compliance, F5 Security + Compliance
• Office 365: E5

Audit (Premium) supports advanced features such as extended retention and intelligent insights for compliance investigations.

How to Configure an Audit Retention Policy

1. Navigate to: Audit > Policies in Microsoft Purview.
2. Create a new audit retention policy.
3. Provide the following details:
   • Policy name
   • Description
   • Retention duration
   • Priority level
4. Record Type: Leave this unselected to apply the policy to all record types.
5. Save the policy to apply your configuration

Important Limitation: Audit logs do not capture actual prompts or Copilot responses. For full content visibility, use Microsoft Purview eDiscovery.

How to Search Audit Logs:

1. Go to Audit > Search in Purview.
2. Configure:
   • Date range.
   • Activities: Interacted with Copilot.
   • Or Operation name: CopilotInteraction.
3. Filter by users or file names if needed.
4. Run the search

Retention:

• Standard: 180 days
• Premium (E5): 1 year, or longer if you have an audit retention policy configure

✅ Step 3: Use eDiscovery for Copilot Activity

Investigations often require searching across large volumes of data. Microsoft Purview eDiscovery lets you find, preserve, and export AI interactions for deeper analysis.

For example, investigators can:

• Search user mailboxes to locate specific Copilot prompts or responses
• Place items on hold to prevent deletion during an active case
• Export results for legal review or external processing

In advanced scenarios, eDiscovery also supports review sets, tagging, filters, and analytics to identify patterns in AI interactions.

eDiscovery features available depend on your organization’s Microsoft 365 license. For example, advanced capabilities of eDiscovery Premium like review sets, analytics, and holds are included with Microsoft 365 E5.

• Navigate to Microsoft Purview > Solutions > eDiscovery.
• Create a new case.
• Add Source
• Search using:
  • Keyword: Salary.
  • Item Class: Copilot Activity.
    There are diffrent apporaches as well, use what fit your case!
• Apply legal hold if required.
• Add the result to a review set.
• Review the activity and Export it for the compliance.
  You can also grant Compliance Officer access to the case as a Reviewer, allowing them to review the case before an export is performed or a hold is applied.
  

✅ Conclusion

AI is reshaping how we work, but with innovation comes responsibility. Microsoft 365 Copilot can unlock huge productivity gains, yet it also introduces new compliance considerations. By using Microsoft Purview for retention, audit, and eDiscovery, organizations can ensure that Copilot interactions are governed with the same rigor as email or Teams chats.

Takeaway is simple: don’t treat Copilot as an exception treat it as part of your compliance ecosystem. With the right retention policies, audit logging, and eDiscovery practices in place, you can embrace AI confidently while meeting regulatory and legal requirements.

Now is the time to review your compliance strategy, test these capabilities in your environment, and prepare your teams. That way, you’ll be ready not just to use Copilot, but to use it responsibly.