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OLMExport

Convert an Outlook for Mac .olm archive

Drop an .olm file below and convert it to the format you need: MBOX for Apple Mail or Thunderbird, EML for individual messages, PDF for a record copy, a searchable HTML archive, a CSV spreadsheet, vCard contacts or an ICS calendar. The file is read by JavaScript in this browser tab. Nothing is uploaded, there is no size limit and there is nothing to install.

No network request carries your file. Check it: open DevTools, Network tab, and run an export. How this works

What do you need from the archive?

Pick a destination; the tool above preloads with that format chosen.

MBOXFor Apple Mail, Thunderbird and most mail apps.EMLOne file per message, opens on a double-click.PDFA printable record copy with full headers.Searchable HTMLOne file you can read and search for years.CSVA spreadsheet, one row per message.Contacts (.vcf)The address book, for Apple or Google Contacts.Calendar (.ics)Appointments, for any calendar app.Just read itOpen the archive and read messages, no export needed.I do not have the .olm yetStep-by-step for exporting the archive from Outlook for Mac.

How it works

An .olm archive is a ZIP container: one XML document per message, contacts and calendar entries in their own XML, attachments alongside as separate files. Nothing about reading that requires Outlook once you have the file.

This page reads the archive one entry at a time rather than loading the whole file into memory, so a 200 MB mailbox and a 12 GB one convert the same way, just for longer.

The output is assembled and written on your machine, then handed to your browser's own download mechanism. It never passes through a server, because there is no server in this conversion at all.

Why it is free

The converters that rank for these searches cost $29 to $49 and cap their trial at the first few messages. This is a static web page. The conversion runs on your computer, so there is no server bill to recover; ads on the page cover the domain. There is no trial limit because there is nothing to unlock.

Questions

Is my mail uploaded anywhere?
No. The archive is unzipped and parsed by JavaScript in this browser tab, on this computer. Check it yourself: open DevTools, go to the Network tab, and run a conversion — nothing goes out. Disconnect from the network after the page has loaded and every conversion still works.
Does this work if Outlook is uninstalled or the licence expired?
Yes. Once you have the .olm file, Outlook is no longer involved. The archive is a ZIP of XML that this page reads directly; nothing here calls Outlook, checks a licence, or needs the app installed.
How big an archive can it handle?
There is no size limit imposed by this page. The archive is read entry by entry rather than loaded into memory whole, and in Chrome and Edge the output is written straight to disk as it is produced. Multi-gigabyte archives work; on Safari or Firefox a very large one is more comfortable converted one folder at a time.
Which browsers work?
Chrome, Edge, Safari and Firefox all read and convert an archive. Chrome and Edge write large exports straight to disk as they are produced; Safari and Firefox assemble the download in memory, which is the one place archive size matters.
Are contacts and calendar complete?
Best effort. Microsoft has never published the .olm format, so contacts and calendar items are read from Outlook's own XML rather than a documented schema. Common fields, name, email, phone, company, event time, location, attendees, map cleanly; anything unusual is skipped rather than guessed at.
Is it free, and what is the paid thing?
The tool is free. A batch mode is being counted, not sold; the button records interest and charges nothing.