Determine order of sources for photos
Supported on: At least Windows Server 2008 R2 or Windows 7
Registry
HKCU
software\policies\microsoft\office\16.0\outlook Value name: preferadphotos
Enabled: preferadphotos = 1
Disabled: preferadphotos = 0
Description
This policy setting controls the order of sources for photos displayed in Outlook. If you enable this policy setting, Outlook will first look at the OAB/AD for the user photo. If this is not available, Outlook will show a Contact photo if the Contact photo is available. If you disable or do not configure this policy setting, Outlook will first look into the Contact Address Books for the user photo. If this is not available, Outlook will look to the OAB/AD if available.