Open manually; may be referenced by an application
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An MSG file is a single e-mail message created with Microsoft Outlook. It contains multiple fields, including the sender and recipient of the message, the date and time the message was sent, and the body of the message.
About Microsoft Outlook
Outlook is an e-mail client and personal information management program developed by Microsoft. In can be used to send and receive e-mail messages for multiple accounts. The program also includes a contact list, calendar, task manager, and journaling features. Outlook is included with some versions of Microsoft Office and is also available as a standalone application.