Apple Mail to Outlook: The Complete Migration Guide (2026)

When You Need to Move From Apple Mail to Outlook

Switching from Apple Mail to Microsoft Outlook is one of the most common email migrations people face. It happens when a company standardizes on Microsoft 365 for all employees, when someone moves from a Mac-only setup to a mixed environment, or when a team needs shared calendars and mailbox delegation features that Apple Mail does not offer natively.

The challenge is that Apple Mail and Outlook use entirely different storage formats. Apple Mail keeps emails as individual EMLX files, while Outlook expects everything packed into a single PST (Personal Storage Table) database. There is no direct bridge between the two, and Outlook offers no built-in EMLX import option.

This guide walks through every step of the migration process, from locating your Apple Mail data to importing the final PST file into Outlook. Whether you have a single account or multiple mailboxes spanning years of correspondence, the methods described here will help you move everything without losing messages, attachments, or folder structure.

Where Apple Mail Stores Your Emails

Before you can migrate anything, you need to know where Apple Mail keeps its data. On macOS, all email data lives inside a hidden folder within your home directory:

~/Library/Mail/V10/

The version number (V10, V9, V8) depends on your macOS version. Inside this directory, Apple Mail organizes data by account. Each account folder contains subfolders that mirror your mailbox structure: Inbox, Sent Messages, Drafts, Trash, and any custom folders you created. The actual email files sit inside Messages subfolders within each mailbox directory.

To access this location, open Finder and press Cmd + Shift + G. Type ~/Library/Mail/ and press Enter. You can now browse through the folder hierarchy.

Each email is stored as an individual .emlx file. A mailbox with 5,000 messages contains 5,000 separate files. Attachments are either embedded inside the EMLX file or stored in companion folders alongside them. This one-file-per-message architecture is efficient for Spotlight indexing but makes bulk migration more involved than formats that use a single database file.

Option 1: Convert EMLX Files to PST

The most direct migration path is converting your EMLX files straight to PST format. This avoids any intermediate steps and preserves your email metadata including dates, sender information, read status, and attachments.

Step-by-Step EMLX to PST Conversion

1. Locate your EMLX files. Navigate to ~/Library/Mail/ as described above. Identify the account and mailbox folders you want to migrate.

2. Create a ZIP archive. Since a typical mailbox contains thousands of individual EMLX files, bundling them into a ZIP archive is the practical approach. Select the mailbox folders you want to migrate, right-click, and choose Compress. This creates a single ZIP file you can upload.

3. Upload to MailtoPst. Go to mailtopst.com/convert/emlx-to-pst and drag your ZIP archive into the upload area. MailtoPst accepts ZIP files and will process every EMLX file found inside, reconstructing the folder hierarchy based on the directory structure.

4. Download the PST file. Once conversion completes, download the resulting PST file. It will contain all your emails organized in the same folder structure as your Apple Mail setup.

This method works well for targeted migrations where you want to move specific mailboxes or accounts. MailtoPst provides 100 MB free credit, which is enough to test the conversion with a representative sample before committing to a full migration. For a deeper walkthrough on EMLX conversion, see How to Convert EMLX to PST.

Option 2: Export as MBOX First, Then Convert

Apple Mail includes a built-in export function that creates MBOX files. This is useful if you prefer to work with a standard, well-documented format as an intermediate step, or if you want to export specific mailboxes selectively.

How to Export MBOX From Apple Mail

1. Open Apple Mail and select the mailbox you want to export in the sidebar.
2. Go to Mailbox > Export Mailbox in the menu bar.
3. Choose a destination folder. Apple Mail creates an .mbox file (technically a folder with that extension) containing all messages from the selected mailbox.
4. Repeat for each mailbox you need to migrate.

Convert MBOX to PST

Once you have your MBOX files, upload them to mailtopst.com/convert/mbox-to-pst. The converter will parse the MBOX file, extract each message, and assemble everything into a properly structured PST file.

The MBOX route adds an extra step compared to direct EMLX conversion, but it gives you more control over exactly which mailboxes are included. It is also a good approach if you have already exported MBOX files for backup purposes and want to bring them into Outlook now.

For large archives, you may find helpful tips in How to Convert Large Email Archives.

Importing the PST File Into Outlook

Once you have your PST file, importing it into Outlook is straightforward regardless of which Outlook version you use.

Outlook on Windows

1. Open Outlook and go to File > Open & Export > Import/Export.
2. Select Import from another program or file, then click Next.
3. Choose Outlook Data File (.pst) and click Next.
4. Browse to your downloaded PST file and select it.
5. Choose whether to allow duplicates, replace duplicates, or skip them.
6. Select the destination folder (usually your main mailbox) and click Finish.

Outlook on Mac

1. Open Outlook and go to File > Import.
2. Select Outlook for Windows archive file (.pst).
3. Browse to your PST file and click Import.
4. Outlook will process the file and add the contents to your mailbox.

Outlook on the Web (Microsoft 365)

For Microsoft 365 accounts, you can import PST files through the Exchange admin center or by first importing into the Outlook desktop client and allowing the messages to sync to the cloud. Microsoft also provides the Azure AzCopy tool for bulk PST imports into Microsoft 365 mailboxes, which is useful for organizational migrations.

Migrating Contacts and Calendar Data

Email messages are usually the bulk of any migration, but contacts and calendar events matter too. Apple Mail itself does not handle contacts or calendars. Those are managed by the Contacts and Calendar apps on macOS, which store data in vCard (.vcf) and iCalendar (.ics) formats respectively.

Contacts

1. Open the Contacts app on your Mac.
2. Select the contacts you want to export (or press Cmd + A for all).
3. Go to File > Export > Export vCard.
4. In Outlook, go to File > Import and import the vCard file.

Calendar Events

1. Open the Calendar app on your Mac.
2. Select a calendar in the sidebar.
3. Go to File > Export > Export and save the .ics file.
4. In Outlook, open the ICS file directly, or go to File > Import and select the file.

Both vCard and ICS are standard formats that Outlook handles natively, so this part of the migration is simpler than the email conversion.

Handling Multiple Apple Mail Accounts

Many users have more than one email account configured in Apple Mail, such as a personal iCloud account, a work account, and perhaps a Gmail account. Each account has its own folder inside ~/Library/Mail/V10/, and each needs to be handled separately during migration.

There are two strategies:

Migrate each account individually. Export or collect the EMLX/MBOX files for each account separately, convert them to PST one at a time, and import each PST into the corresponding account in Outlook. This keeps everything organized and makes it easy to verify that each account migrated correctly.

Merge all accounts into a single PST. If you want a consolidated archive, you can bundle all your EMLX files from multiple accounts into a single ZIP and convert them at once. The resulting PST will contain all messages in one file, though you may want to organize them into subfolders before importing.

For more details on the Apple Mail to Outlook workflow, see our dedicated Apple Mail to Outlook use case.

Common Issues and How to Solve Them

EMLX files are not visible in Finder

The ~/Library/ folder is hidden by default on macOS. Press Cmd + Shift + G in Finder and type the path manually. Alternatively, hold the Option key while clicking the Go menu in Finder to reveal the Library option.

Attachments are missing after conversion

Apple Mail sometimes stores attachments in a separate Attachments folder adjacent to the Messages folder within each mailbox. When creating your ZIP archive for upload, make sure to include both the Messages and Attachments folders to ensure everything is captured.

Folder structure is flat after import

If your emails appear without the expected folder hierarchy after importing the PST, check that you preserved the directory structure when creating the ZIP archive. MailtoPst uses the folder names in the ZIP to reconstruct the mailbox hierarchy in the PST file.

Conversion fails for very large mailboxes

If your mailbox exceeds several gigabytes, consider splitting it into smaller batches. Convert one year of email at a time, or split by top-level folder. This makes the upload faster and lets you verify each batch independently.

Start Your Migration

Moving from Apple Mail to Outlook does not have to be complicated. Whether you choose the direct EMLX to PST path or the MBOX to PST route through Apple Mail’s export function, MailtoPst handles the format conversion entirely in the cloud.

Upload your files, download the PST, and import it into Outlook. The entire process runs in your browser with no software to install. You get 100 MB free credit to test the conversion with your own data before deciding on a full migration.

Convert now