Convert an Outlook for Mac .olm export into a Windows Outlook .PST and keep your Mac folders intact.
Open the app 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.
The converter 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.
Choose a spot on your Windows drive and start. Outlook does not even need to be open for this step.
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.
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.
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.
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.
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 converter parses the container and OPF message fields on its own - the exact job Windows Outlook does not do.
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.
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.
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.
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.
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:
OLM to PST Converter
9 Mb
1.0
23/04/26