Compliance Problems

How to Audit Outlook Attachment Downloads in Microsoft 365

Bushra Parveen Sep 27, 2026 869 views

Question details

The user needs to know how to track or audit when users download attachments from emails in Microsoft Outlook using Microsoft 365.

How to Audit Outlook Attachment Downloads in Microsoft 365

Product: Microsoft 365
Device & OS: not provided
Scenario: Tracking email attachment downloads for compliance or security monitoring.
Observed behavior: Native Microsoft 365 audit logs do not specifically record the action of downloading an attachment from the Outlook app.

Before you start

Ensure you have global administrator or compliance administrator permissions in Microsoft 365 to access and configure Microsoft Purview audit logs.

Solution 1Recommended

Review related mailbox activities in Microsoft Purview

While you cannot track the specific attachment download action, you can monitor related actions like email reads and sends to infer user activity.

Microsoft 365 audit logs do not currently capture the exact event of downloading an attachment from the Outlook client. However, tracking when a user accesses, reads, or forwards an email provides circumstantial evidence of their interaction with the attached files.

Access Microsoft Purview

Navigate to Audit

Go to Solutions, then select Audit in the left navigation pane.

Search for Exchange activities

Under the 'Activities - friendly names' field, search for Exchange mailbox activities such as 'Accessed mailbox items', 'MessageBind' (reading an email), or 'Sent message'.

Export and review

Run the search for your desired date range and export the results to a CSV file to analyze user interactions with specific emails.

Review related mailbox activities in Microsoft Purview

Audit log limitations: Tracking 'MessageBind' (email read events) requires Audit (Premium) licenses, and mailbox auditing must be explicitly enabled for the tenant.

Solution 2

Implement third-party monitoring solutions

Use specialized security software integrated with Microsoft 365 to gain granular visibility into attachment downloads and data exfiltration.

Solution 3

Submit a feature request to Microsoft

If native attachment tracking is a strict compliance requirement for your organization, submit a formal request to the Microsoft product team.

Free Microsoft Office alternative

Looking for a cost-effective alternative to Microsoft Office?

While auditing Outlook attachments requires specific compliance tools, managing your downloaded documents doesn't have to be complicated or expensive. WPS Office provides a lightweight, free alternative to Microsoft Office for creating, editing, and managing your Word, Excel, and PowerPoint files.

1. Download the installer: Visit the official WPS Office website and click the Free Download button.
2. Install the software: Run the downloaded installer and follow the quick on-screen instructions.
3. Open your attachments: Launch WPS Office to instantly view and edit your downloaded document attachments.

Fully compatible with Microsoft Word, Excel, and PowerPoint formatsLightweight application that opens files instantly and runs smoothlyBuilt-in PDF editing and management features for downloaded attachmentsFree to download and use with a highly familiar interface

microsoft office alternative - wps office

Frequently Asked Questions

Does Microsoft 365 track when an email attachment is forwarded?

While downloading isn't directly tracked, Microsoft 365 audit logs can track 'Send' or 'SendAs' events. If a user forwards an email with the attachment, that forwarding action is recorded in the Exchange mailbox audit logs.

How do I enable mailbox auditing in Microsoft 365?

Mailbox auditing is turned on by default for Microsoft 365 organizations. However, you can manage specific audited actions by using Exchange Online PowerShell and running the Set-Mailbox cmdlet.

Can Microsoft Purview track attachment downloads in SharePoint or OneDrive?

Yes. Unlike Outlook email attachments, if a file is stored in SharePoint Online or OneDrive for Business and shared via a link, Microsoft Purview actively tracks and logs the 'Downloaded file' event.

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