Is it possible not to embed .wav voice mails?

Hi there!
I am currently using Exchange 2007 along with my Windows Server 2008 Standard 64bit. I was just wondering if it’s possible for me not to embed .wav voicemails.
I already tried removing the UM profile of the user but their e-mail still has an embedded .wav file of the message.
I apologize if you’ll find my explanation a little unclear but please feel free to ask me if you require more details.
I am looking forward to your response. Thank you.
