I don't know. The people who do know hang out in one or more of these
groups:

microsoft.public.netspeechsdk
microsoft.public.speech_tech
microsoft.public.speech_tech.sdk

Also note that there are two speech SDKs. One, SAPI v5.1 which targets
ATL/COM clients and provides an Automation (IDispatch) interface for
everyone else and the newer .Net Speech Applications SDK (SASDK) which uses
.Net and SALT technologies.

When you post again in a speech group either state which technology you are
considering or ask about your options if you are open.

Regards,
Will

P.S. It may turn out that CE is not an option, sorry but as I said, I just
don't know.