How to save an encrypted iPhone voice mail as an mp3 on Windows

My daughter left me her voice mail today.  She had her mom's phone on the way home, called me, and cried for 72.78 seconds.  I had to save this voice mail, so this is how I did it:

1. Backup your iphone using iTunes
2. Download Backuptrans itunes Backup Extractor: http://www.backuptrans.com/itunes-backup-extractor.html
3. This will allow you to retrieve up to 3 voice mails
4. To convert the .amr file to .mp3, use http://audio.online-convert.com/convert-to-mp3