MSG versus EML

Two email files. Very different containers.

MSG preserves Outlook MAPI properties in compound storage. EML preserves an internet message with headers and MIME parts, making it more portable across mail software.

Workspace status

Ready · Local browser memory

Open an email file

Open it once. Reader, safety, headers, route, redaction, and export reuse the same in-memory source.

.EML
.MSG
.EMLX
winmail.dat
Processed locally. Files and filenames stay on this device.
Workflow

From source file to finished result

Runs locally
  1. Step 1

    Open either format

  2. Step 2

    Inspect the fields each source preserves

  3. Step 3

    Convert MSG to EML when you need portability

What this workspace preserves

MSG can contain non-email Outlook items

EML exposes raw internet headers

Both can contain HTML, text, and attachments

Questions about this workflow

Which format is better for long-term portability?

EML is generally understood by more email applications, while MSG may retain Outlook-specific fidelity.

Does converting MSG to EML preserve everything?

It preserves recovered standard message content, but some Outlook-only properties have no equivalent MIME field.