If you are switching from Mac Outlook (OLM files) to Windows Outlook (PST files), you’ll need to convert your OLM mailbox data into PST format, since Outlook for Windows doesn’t support OLM files.

Why Conversion is Needed?

• Mac Outlook stores data in .olm files.

• Windows Outlook stores data in .pst files.
  Since the formats are different, a direct import isn’t possible without conversion.

Manual Methods (Limited & Time-Consuming):

There is no direct built-in option in Outlook for this. However, you can try indirect methods such as:

1. IMAP Configuration Method

   • Add a Gmail/IMAP account in Mac Outlook.

   • Sync all emails from OLM to the IMAP account.

   • Add the same IMAP account in Windows Outlook and export to PST.

   • Limitation: Works only for emails (contacts, calendars may not sync properly).

2. Export/Import via Archive

   • Export emails from Mac Outlook into an archive.

   • Import them into Windows Outlook.

   • Limitation: Partial transfer, not suitable for large mailboxes.

Recommended Solution: Use a Professional OLM to PST Converter

For complete migration including emails, attachments, contacts, calendars, notes, and tasks, the easiest and safest way is to use a reliable ATS OLM to PST converter tool.

• Converts entire OLM mailbox to PST in one go.

• Maintains folder structure and metadata.

• Supports large OLM files.

• Works with Outlook 2011, 2016, 2019, and Microsoft 365.

Conclusion:
If you only have a small number of emails, the IMAP method may work. But for complete mailbox migration, a dedicated ATS OLM to PST converter software is the most efficient choice.