SharingItem.PermissionTemplateGuid Property (Outlook)
Returns or sets a String that represents the GUID of the template file to be applied to the SharingItem in order to specify Information Rights Management (IRM) permissions. Read/write.
The PermissionTemplateGuid property should be synchronized with the Permission property to accurately reflect the permission status of the SharingItem. Setting the PermissionTemplateGuid property to a valid GUID should also incur setting the Permission property toOlPermission.olPermissionTemplate.
An empty string value for the PermissionTemplateGuid property means there is no permission template file specified for the SharingItem. This occurs when no IRM has been set up (in which case the Permission property is OlPermission.olUnrestricted), or the restriction is not to forward the SharingItem (in which case the Permission property is OlPermission.olDoNotForward).
If you attempt to set the PermissionTemplateGuid property for a received message (that is, the Sent property of the SharingItem is True), Microsoft Outlook returns an error.