I've spoken with Cepstral, the problem is the fact that MS Agents require sapi 4.0 speech engines. The reason the voices work with zabaware characters is that they are not MS Agents. Apparantly, Cepstral decided to bypass sapi 4.0 figuring eventually everything will migrate to sapi 5, however it sounds like there have been a lot of requests for sapi 4.0 support. They are evalutating backwards compatibility. The more requests they receive, the more likely they are to seriously implement it. Email them at info@cepstral.com