Outlook: Browse Conversation Files

🚨 The Signal: Outlook now aggregates all conversation attachments into a single view. This simplifies file access but increases the risk of inadvertent data exposure if users share sensitive information without proper controls.

The Impact

End users are affected by easier file access, increasing the risk of accidental data leakage if sensitive files are shared.

• End Users: Easier access to files may lead to accidental sharing of sensitive data.
• Security Teams: Increased risk of data exfiltration through simplified attachment access.
• Compliance Teams: Potential for non-compliance with data handling policies due to easier file discovery.

The Action

1. Review and reinforce existing data loss prevention (DLP) policies in Microsoft Purview to detect and prevent sharing of sensitive information via Outlook attachments.
2. Educate users on the risks of sharing sensitive information via email and the importance of using secure collaboration platforms for confidential data.
3. Monitor Microsoft Purview audit logs for unusual file access or sharing patterns related to Outlook attachments.

Domain: Exchange · Impact: medium · Workload: Exchange Online