Email plus Voice is a Outlook Express (Windows Mail) plugin, that allows to add a voice to the mail message.
It has simple and convenient interface and enhanced capabilities.
It works with Outlook Express 5,6 and Windows Mail.
MPEG Layer-3 (mp3) compression is used for recording. It allows to create small size files (1sec - 1KB) with a high quality.

The license of this software is Free Trial Software, the price is $27, you can free download and get a free trial.