User Configuration > Administrative Templates > Microsoft Outlook 2016 > Outlook Options > Other
User
HKCU\software\policies\microsoft\office\16.0\outlook\options
This policy setting configures the link to the user's My Site (when detected) where the user's photo can be uploaded. This link is under the File tab. If you enable this policy setting, the link is not visible. If you disable or do not configure this policy setting, the link is visible.