http://blogs.technet.com/greg_katz_-_messaging_in_education/archive/2008/05/30/mwi.aspxTurn the light on. We have IP phones on campus that we’ve purchased. If we go with Exchange UM how can we light the phone. Exchange 2007 UM doesn’t provide MWI out-of-box. This requires a 3rd party server application. We have three great partners in thisen-USCommunityServer 2.1 SP1 (Build: 61025.2)