Do not allow expired certificates when validating signatures

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

Registry

HKCU software\policies\microsoft\office\16.0\common\signatures

Value name: ignoreexpiredcert

Enabled: ignoreexpiredcert = 0

Disabled: ignoreexpiredcert = 1

Description

This policy setting allows you to configure Office 2016 applications to accept expired digital certificates during verification of digital signatures. If you enable or do not configure this policy setting, Office 2016 applications display digital signatures created with expired certificates as invalid. If you disable this policy setting, Office 2016 applications treat expired certificates as valid.