How to convert .cam files to .mp3 format.
Converting MSN Messenger Webcam Recordings directly to MP3 Audio Files (.cam to .mp3 conversion) is, per se, not possible; at least not without a workaround.
Your best bet is to first convert CAM to MP4. You can then easily convert MP4 to MP3.
We are not aware of any media editing software or (online) conversion tool capable of directly converting CAM to MP3.
The database currently does not contain any cam software converter.