Disable AutoPreview

Supported on: At least Windows Server 2008 R2 or Windows 7

Registry

HKCU software\policies\microsoft\office\16.0\outlook\preferences

Value name: disableautopreview

Enabled: disableautopreview = 1

Disabled: disableautopreview = 0

Enabling this policy permanently disables the item preview. Users cannot turn it back on and the ribbon UI to change it is disabled.