Like the program of that name in windows mobile? I dont think so there's ask ziggy and you can use voice commands in bing and elsewhere on the phone anywhere whers thers a little mic button on the bottom button line on screen wiuth the ---
Communicator never made it onto Windows Phone I think it was on some Nokia E series phones but I never used it. Lync 2010 is the new Communicator, As others have said you will need an Office 365 or OCS 2010 server to run it.