I too am looking for a solution, MagicJack sends email with an embedded .wav file, as does my corporate voicemail, not Avaya, but another VOIP provider. For my treo 700P I purchased mvisualvoicemail from motionapps.com played .wav files much like verizon's subscription service. perhaps youmail would be a fix, but am not sure. anyone?
I'm having the same issue with not able to open WAV file from my email for voicemail. I have youmail as voicemail for personal use but that has nothing to do with retrieving WAV file and listening it from email. I can listen and open MP3 easily but have issues with WAV file. If anyone has a solution for this please help. I downloaded many apps that supposedly plays WAV file but it still doesnt play. Still have the message of "this attachment cannot be display". I took it to a VZW store and they still couldnt help me.
That worked perfefctly! Thanks for finding a solution and the work around on this matter. I was hoping we didnt have to go through this process just to listen to our work voicemail. Hopefully they will fix this on the next firmware update. Thanks again for the information!