Email plus Voice for Microsoft Outlook - Version 1.0 Email plus Voice is a Microsoft Outlook add-in, that allows to add a voice to the mail message. It has simple and handy interface and enhanced abilities. It works with Outlook 2000/XP/2003/2007. MPEG Layer-3 (mp3) compression is used for recording. It allows to create small size files (1sec-1KB) with a high quality.