Missing root certificates

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

Registry

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

Options

sigstatusnotrustdecision enum
  • Neither error nor warning -> 0
  • Warning -> 1
  • Error -> 2

Description

This policy setting controls how Outlook functions when a root certificate is missing. If you enable this policy setting, you can choose from three options that determine how Outlook functions when a root certificate is missing. - Neither Error nor Warning. This option displays neither an error nor a warning, and enforces the default configuration in Outlook. - Warning. This option ensures that Outlook displays a warning message when a root certificate is missing. - Error. This option ensures that Outlook displays an error message when a root certificate is missing. If you don't configure this policy setting, users will see an error when a root certificate is missing.