User Configuration > Administrative Templates > Microsoft Outlook 2016 > Outlook Social Connector
User
HKCU\software\policies\microsoft\office\outlook\socialconnector
This policy setting controls whether certain info-bar messages that will prompt users to install social network providers are displayed in the social connector. If you enable this policy setting, the info-bars are not shown. If you disable or you do not configure this policy setting, the info-bars are shown.