The older drivers were still supported under Vista, but since the older model did not encompass support for features first introduced with Vista, those newer features would necessarily be disabled when an older driver was active. As a consequence, when a mirror driver designed for the older model was active, such as when Windows Remote Assistance or Windows Live Mesh were in use, Vista disabled Desktop Window Manager and Windows Aero.
Older drivers remained functional under Vista, but because they lacked support for features introduced with Vista, newer features would be disabled whenever an older driver was in use. As a result, when a mirror driver designed for the older model was active, such as during Windows Remote Assistance or Windows Live Mesh usage, Vista disabled Desktop Window Manager and Windows Aero.