Outlook voicemail preview is a new feature to Exchange 2010 unified messaging. In Exchange 2007 UM, you see caller information and message priority. Exchange 2010 kicks it up a notch with speech-to-text functionality. Before the voicemail message arrives in your inbox, Exchange UM transcribes the voicemail and puts the text in the body of the email.
Although Voice Preview is not perfect, it’s pretty accurate. This is especially helpful for spam voicemail with anonymous caller information. Using this function, a user can save time, and frustration, by deleting unwanted messages without listening to them with no fear of deleting a legitimate message.