Attachments opened from Outlook must be in Protected View.

This policy setting allows for determining whether Word files in Outlook attachments open in Protected View. If enabling this policy setting, Outlook attachments do not open in Protected View. If disabling or not configuring this policy setting, Outlook attachments open in Protected View.

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Word 2016 -> Word Options -> Security -> Trust Center -> Protected View "Turn off Protected View for attachments opened from Outlook" is set to "Disabled".

Procedure: Use the Windows Registry Editor to navigate to the following keys:

HKCU\Software\Policies\Microsoft\Office\16.0\word\security\protectedview

Criteria: If the value DisableAttachmentsInPV is REG_DWORD = 0, this is not a finding.

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Word 2016 -> Word Options -> Security -> Trust Center -> Protected View "Turn off Protected View for attachments opened from Outlook" to "Disabled".