OLM to PST Converter OLM to PST Converter
4.5 · 1142 votes

Download OLM to PST Converter Software for Windows

OLM to PST Converter Software turns an Outlook for Mac .olm export into a Windows Outlook .PST and keep your Mac folders intact.

   
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Windows 11 / 10Free trial, no sign-up
OLM to PST Converter Screenshot.
Windows Outlook will not open an .olm file. Microsoft's own support forum says the import is not possible on Windows. The free workaround it points to runs five steps. First you export the mail. That goes up through an online account. Then the whole mailbox syncs back down on the Windows side. Fine in theory, slow and cloud-dependent in the practice. This Windows OLM to PST Converter Software reads the .olm directly and writes a single Outlook .PST instead, folders and all. Download it, run the .olm through once, and the mail opens on Windows.

How to download and use OLM to PST Converter Software

Add your OLM file.
1

Add your OLM file

Open the OLM to PST Converter and point it at the .olm you exported from Outlook for Mac. One file usually holds a whole mailbox, so you add it once, not message by message.

Keep the folder tree.
2

Keep the folder tree

The OLM to PST Converter Software reads the mailbox inside the archive and rebuilds it. Inbox, Sent and your own subfolders land in the PST the same shape they had on the Mac, not as one flat dump of loose mail.

Pick where to save.
3

Pick where to save

Choose a spot on your Windows drive and start. Outlook does not even need to be open for this step.

Open the PST in Outlook.
4

Open the PST in Outlook

In Outlook, go to File, Open and Export, Open Outlook Data File, and pick the new .pst. The mail is there with its dates, read state and attachments, sitting in the same folders as before.

Why use OLM to PST Converter Software

Skip the cloud detour and go straight from .olm to PST.

Skip the cloud detour and go straight from .olm to PST

The free route Microsoft points to runs the whole mailbox through an online account and back down again to Windows. It works, but it needs a live account as a middleman, a working copy of Outlook on the both ends, and the patience to wait out a full sync. Reading the .olm straight into a PST drops all of that.

  • No dragging mail into folders by hand after the move.
  • The mailbox is converted on your own PC, with nothing uploaded to a server.
  • Outlook does not have to be open, or even installed, while it runs.
  • One .olm file becomes a single PST you open in one step.
   
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What this OLM to PST converter does

A real Outlook PST

SoftOrbits OLM to PST Converter writes a valid Unicode .pst, and we tested the result in Outlook 2016. It is a genuine Outlook data file, not a renamed archive that Outlook opens half-broken.

Folders and fields kept

The folder tree carries over instead of collapsing into one pile. Subject lines survive in any language, Korean and Hebrew included. Bodies come in HTML or plain text. The From, To and Cc, the sent date and the read mark all carry across, and file attachments come out byte for byte.

It reads the .olm container itself

An .olm is a Microsoft-only ZIP archive that holds one XML file per message, with attachments stored as separate files inside. Microsoft never published a spec for it, so the OLM to PST Converter Software parses the container and OPF message fields on its own - the exact job Windows Outlook does not do.

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Built for Outlook for Mac exports

It takes the .olm you get from the File, Export command in Outlook for Mac, and the 2011, 2016, 2019 and Microsoft 365 for Mac versions all write this same format. It is not the Apple Mail format, which is a separate thing entirely.

Who it is for

Moving a Mac fleet to Windows

An admin retires the Macs and hands the team Windows machines. Each person exported their Outlook for Mac mailbox to an .olm, and now those files have to land in Windows Outlook without losing a single subfolder along the way.

One person who switched from Mac to PC

You bought a Windows laptop, exported your mail out of Outlook for Mac, and then found Windows Outlook has no way to open the .olm at all. This converts it so the old mail opens on the new machine.

Cleaning up an inherited mailbox

A colleague left, their Outlook for Mac export is sitting on a share, and someone needs it readable in Windows Outlook. One .olm goes in, one searchable PST comes out.

OLM sources it reads

The .olm extension comes from one program, Microsoft Outlook for Mac, across its releases. These are the exports the converter opens, plus the one format people mix it up with:

SourceFileComes fromNotes
Outlook for Mac 2011.olmOutlook for Mac 2011The oldest export still found in archives
Outlook for Mac 2016.olmOutlook for Mac 2016The common corporate export
Outlook for Mac 2019.olmOutlook for Mac 2019File, Export writes the same OLM
Microsoft 365 for Mac.olmOutlook for Mac, Microsoft 365Same OLM archive from File, Export
Apple Mail (not OLM).mbox / .emlxThe macOS Mail appA different format - use the Apple Mail converter instead
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OLM to PST Converter
OLM to PST Converter
Price
from $ 29.99
Version
1.5
File Size
9 Mb
Last updated on
23/07/26
System Requirements
  • Windows 11/10/8.1/8/7 (32/64 bit)
  • Intel i3, AMD Ryzen 5 or above
  • 4 GB of RAM or above
  • NVIDIA® GeForce® series 8 and 8M, Intel® HD Graphics 2000, Quadro FX 4800, Quadro FX 5600, AMD Radeon™ R600, Mobility Radeon™ HD 4330, Mobility FirePro™ series, Radeon™ R5 M230 or higher graphics card with up-to-date drivers
  • 1280 × 768 screen resolution, 32-bit color
  • 1 GB of free hard disk space or above

Frequently Asked Questions

You convert it first. Windows Outlook has no menu that opens an .olm, and Microsoft's own support forum confirms the import is not possible on the Windows side. This tool turns the .olm into a .pst, and that Outlook opens the normal way.

Yes, that is the whole job of it. OLM to PST Converter Software reads the Outlook for Mac .olm and writes a standard Windows Outlook .pst. Folders, dates, read state and attachments all carry over, and the .pst opens on any Windows PC.

An .olm is the file Outlook for Mac makes when you use File, Export. Inside, it is ZIP archive holding one XML file per message plus the attachments. It belongs to the Mac version of Outlook, and Microsoft never released a public spec for it.

They both carry Outlook mail, but they are not the same format and not interchangeable. PST is the data file Windows Outlook uses; OLM is the export from Outlook for Mac. Windows Outlook reads the PST and ignores the OLM, which is the whole reason a conversion sits between them.

Point the converter at the .olm, choose where to save, and let it write the .pst. Then open that .pst in Windows Outlook through File, Open and Export. There is no online account to set up and no mailbox to sync first, which is what the free manual workaround asks of you.

No on both counts. OLM comes from Outlook for Mac, the Microsoft program. Apple Mail is the separate app built into macOS, and it keeps mail as .mbox and .emlx, not .olm, so it cannot import an .olm either. If your mail came out of Apple Mail rather than Outlook for Mac, that is a different format and a different converter.

Yes. The conversion does not drive Outlook, so Outlook does not have to be installed or running while the .olm is read and the PST is written. You only need Outlook at the end, on the Windows side, to open the finished .pst.

Short answer: no. Long answer: the whole conversion happens on your own PC, and nothing is sent out. Online OLM converters ask you to upload the .olm to their server first, which for a company mailbox is a lot of private mail to hand to a stranger; here the file never leaves your machine.

The output is a standard Unicode PST, the same data file that desktop Outlook uses. We tested it in Outlook 2016, and it opens the same way in desktop Outlook through Microsoft 365. The newer web-style Outlook keeps its own limits on data files, as it does with any PST.

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Author: SoftOrbits (English)
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Avg. rating: 4.5 from 1142 votes
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