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.olm

Outlook for Mac Archive

Email & Calendar

OLM is an Outlook for Mac archive, distinct from PST. Import/export availability depends on version and license; the documented workflow currently targets legacy Outlook.

Main use
Archive Mac mail, contacts and calendar items
Data type
Binary data
All sections, questions and sources

Content reviewed： · Editor：Kai

Opening steps

Choose your environment or purpose to see its steps.

Outlook for Mac with OLM import/export support

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

  1. Open Import in a compatible Outlook for Mac edition.
  2. Select the OLM archive.
  3. Inspect local imported folders and item counts.
Inspect the received file and its requirements

Establish dependencies and settings before proceeding.

  1. Check OLM import/export availability in your edition.
  2. Check which item types were selected for export.
  3. Preserve source Outlook data and the original OLM.

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

Troubleshooting by symptom

  • No menu: check edition, license and management policy.
  • Not in Inbox: inspect local imported folders.
  • No contacts/calendar: check export item selection.
  • Cannot open on Windows: choose a supported migration route rather than renaming to PST.

OLM → compatible Outlook import

  1. Import into a supported Mac edition first, then plan supported export/sync for the destination.
  2. Reopen the output and check it against the preservation points in this guide before handoff.

Import alone does not necessarily restore every item to the server.

Archive versus synchronized account

Selected archive items do not imply restoration of account settings, rules, signatures or the whole environment.

Source for these steps：Microsoft · Export items to an archive file in legacy Outlook for Mac / Microsoft · Import items into legacy Outlook for Mac

Worked example: checks before handoff

Example: compare oldest/newest mail, attachments, contact counts and appointment times during a Mac migration.

Source for these steps：Microsoft · Export items to an archive file in legacy Outlook for Mac / Microsoft · Import items into legacy Outlook for Mac

Related-format differences

Related-format differences
Format / methodPurpose and preserved information
.olmArchive Mac mail, contacts and calendar items
PST / MBOXOutlook data used on Windows and elsewhere / mailbox exchange.
OLM → compatible Outlook importImport alone does not necessarily restore every item to the server.

Handling and security

The archive can contain private mail and calendars; review any converter upload scope.

Questions and answers

Can I rename it to PST?

The internal formats differ.

Can Outlook web open it directly?

Use the documented application import route.

Discard the original immediately after import?

Retain it until all required item types are checked.

Format facts: name, steward and MIME type
Formal name
Outlook for Mac Archive
Steward / specification
Microsoft
MIME type
Consult the producer or delivery system. The extension alone does not establish a MIME type.

Primary and official sources