application/vnd.ms-outlook

Important: An officially mentioned type either does not exist, or is hard to track down. The information here likely reflects community contributions or popular usage derived from existing implementations.

A single Outlook item saved out as a standalone file: an email, an appointment, a contact or a task. Internally it is a Microsoft Compound File Binary container holding the item's MAPI properties, so unlike a .eml file it preserves Outlook-specific fields instead of following the RFC 5322 message format.

This type is not registered with IANA, but it is what Microsoft's own documentation uses and what e-discovery and archiving tools consistently expect. You may also see the generic application/octet-stream in the wild when a server has no mapping for the extension.

File types

.msg

Also appears as

Not known to appear as any other types

Further reading

  1. Library of Congress - Microsoft Outlook Item (MSG)
  2. Microsoft Learn - Supported file types in eDiscovery

Related to

No related mimetypes listed