Outlook Message — individual email in Microsoft proprietary format
MSG is Microsoft's proprietary format for individual email messages saved from Outlook. Unlike EML, MSG files use Microsoft's Compound File Binary Format (CFBF) and can store rich formatting, embedded objects, and Outlook-specific metadata like categories and flags. MSG files are commonly shared in enterprise environments.
Origin
Microsoft Outlook
Used by
Outlook on Windows, Exchange, enterprise email workflows
MSG is Outlook-only, EML opens everywhere. Learn the difference, when to use each format, and how to convert MSG to EML or EML to MSG free online.
EML files store individual emails and open in almost any email client. Learn what's inside an EML file, how to open one, and how to convert EML to PST, MBOX or MSG.
First conversion free. No credit card required.