This module reads e-mail messages stored as .msg files (such as generated
by Outlook), and converts them to Email::MIME objects. It also includes a
command-line interface in the form of the msgconvert script.

Such files may be identified by file(1) as follows:
Composite Document File V2 Document

You do not need Outlook installed to use this module.

WWW: https://metacpan.org/release/Email-Outlook-Message