Thanks for the info Dan.
We never tried the SALT and managed code apps running side by side, as we were told that the server would run one or the other but not both. This was before the workflow came into play.
We will give this a try, running all three on a server.
The scenario would be where a customer has an MSS 2004 app that gets upgraded to run on the new ocs 2007 ss. Then new applications were developed using the managed code (now using the work flow). The customer may also want to take advantage of an existing VoiceXML application.