MOMI functions that utilize speech require Windows XP (or later).
Speech can be enabled on Windows 2000 by searching Microsoft's web site for the following download:
Speech SDK 5.1 (or later)
The Speech 5.1 SDK Redistributables are used just to enable Speech. Note that this is a rather large file.
In the event that the Speech environment is not compatible with the MOMI PC Client, the runtime parameter NOSPEECH may be used to bypass normal client speech detection logic and force the client to disable speech processing.