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THE FILE FIELD GUIDE
.mbox

Mbox Mailbox

Email & Calendar

MBOX stores a sequence of messages. A delivery may be a file or an application-created .mbox directory; copy the whole set and inspect attachments and encoding.

Main use
Migrate or archive collections of messages
Data type
Text data
All sections, questions and sources

Content reviewed： · Editor：Kai

Opening steps

Choose your environment or purpose to see its steps.

Mbox-capable mail software such as Apple Mail

Preserve the original and inspect a working copy in a compatible application.

  1. Open the application’s mailbox import tool.
  2. Choose mbox or Apple Mail according to the exporter.
  3. Locate the imported local mailbox.
Inspect the received file and its requirements

Establish dependencies and settings before proceeding.

  1. Identify producer and whether the item is a file or directory.
  2. Keep the entire export including attachment data.
  3. Record message count and date range.

Menu labels and support vary by app, OS and version. Preserve the original before making changes.

Troubleshooting by symptom

  • Too few messages: check selected input and subfolders.
  • Attachments absent: check source download/export completeness.
  • Garbled text: inspect source encoding and display settings.
  • Duplicates: check the existing imported mailbox before repeating.

MBOX → imported mailbox

  1. Import the mailbox, then separately save needed individual messages as EML/PDF.
  2. Reopen the output and check it against the preservation points in this guide before handoff.

Folders, labels, rules and account settings require separate checks.

Distinguish archive and server sync

Local import does not necessarily restore messages to the server. Consider duplication and quota before moving them into a shared account.

Source for these steps：Apple · Import or export mailboxes in Mail on Mac / Apple · Save emails as files or PDFs in Mail on Mac

Worked example: checks before handoff

Example: check counts, oldest/newest messages and large attachments in an authorized work archive.

Source for these steps：Apple · Import or export mailboxes in Mail on Mac / Apple · Save emails as files or PDFs in Mail on Mac

Related-format differences

Related-format differences
Format / methodPurpose and preserved information
.mboxMigrate or archive collections of messages
EML / OLMSingle message / Outlook for Mac archive.
MBOX → imported mailboxFolders, labels, rules and account settings require separate checks.

Handling and security

Review message, attachment and address privacy before uploading to a converter.

Questions and answers

Direct opening in Outlook?

Check supported import formats in that edition.

Does it transfer account passwords?

Mailbox content and account settings are separate.

What if it is too large?

Prefer source-app range exports over manually splitting the original.

Format facts: name, steward and MIME type
Formal name
Mbox Mailbox
Steward / specification
Apple
MIME type
Consult the producer or delivery system. The extension alone does not establish a MIME type.

Primary and official sources