What this guide covers
This guide explains how to fully migrate your Outlook email — including all folders and attachments — from a PST file into Apple Mail on Mac. Whether you have just switched from Windows or are leaving Outlook on macOS, the process is the same.
What is a PST file?
A PST file (Personal Storage Table) is an archive format used by Microsoft Outlook to store emails, calendar items, contacts, and tasks locally on a computer. When you export email from Outlook or back up an Outlook profile, the result is typically a .pst file. PST files can range from a few megabytes to tens of gigabytes for large mail archives.
Why Apple Mail cannot open PST files directly
Apple Mail stores email using the mbox and emlx formats — completely different structures from PST. Apple Mail has no built-in PST reader, so the file must be converted before import.
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Step-by-step: migrate PST to Apple Mail on Mac
1
Gather your PST files
Identify all PST files you want to migrate. Large Outlook installations often have multiple files — a main data file and a separate archive. Note their location on your Mac or external drive before starting.
2
Run the offline PST converter
Open the PST to Apple Mail converter and select your PST file. The tool processes the archive entirely on your Mac — reading all emails, subfolders, and attachments from the PST file and producing output compatible with Apple Mail.
3
Import into Apple Mail
In Apple Mail, choose File > Import Mailboxes and point it to the converted output folder. Apple Mail will import your emails and recreate your folder hierarchy.
4
Verify the import
Spot-check key folders to confirm all emails and attachments transferred correctly. Compare your Apple Mail mailbox against the original PST structure to make sure nothing is missing.
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What gets preserved during conversion
Email messages and body content
Original folder structure
Attachments
Sent and received dates
Email headers
Subfolders
Tips for large PST files
If your PST file is several gigabytes, allow extra time for the conversion. Keep your Mac plugged in during the process. The converter handles large archives without needing to split or pre-process the file manually.
After the import
After importing, your emails appear in Apple Mail under an "Import" mailbox. You can move them into your main mailbox folders or leave them organised as imported. Your original PST file is not modified — keep it as a backup until you have confirmed the import is complete.
Why use an offline converter?
Online PST tools require uploading your entire email archive to a third-party server. Email archives often contain sensitive personal, financial, and professional information. An offline converter keeps all processing on your own Mac — your data never leaves your machine.
Frequently Asked Questions
What is the best way to convert PST to Apple Mail on Mac?
The most reliable method is an offline PST converter that runs directly on your Mac, avoiding cloud uploads and handling large files reliably.
How long does PST to Apple Mail conversion take?
Small archives convert in a few minutes. Larger archives take longer but run in the background on your Mac.
Will attachments be preserved during conversion?
Yes. A full PST converter preserves email attachments along with the original emails and folder structure.
Can I convert a PST file on Mac without Outlook installed?
Yes. PST files are self-contained archives that can be processed by a standalone converter without Outlook on your Mac.
Does converting PST to Apple Mail delete the original PST file?
No. The converter reads your PST file and creates a new output — your original PST file is left untouched.
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