Microsoft Entourage
From Just Solve the File Format Problem
Microsoft Entourage was the email client included in the Office suite for Macintosh, from 2000 to 2008[1]. Product was replaced with Outlook.
File Information
RGE files are archived mailboxes exported from Entourage, they are in the Bundle / Package format. Within the package is an XML, folders of calendar, contacts, notes, tasks, and an Mbox with archived email.[2]
