Export mailboxes from Apple Mail

Step 1: Make sure everything is downloaded

With iCloud, IMAP and Exchange accounts, Mail may keep only part of your mail (or no attachments) on the Mac. Only what is stored locally gets exported, so check this first:

1. Open Mail → Settings (Preferences on older macOS) → Accounts.
2. Select the account, open the Account Information tab and set Download Attachments to All.
3. Close Settings and give Mail time to download. Selecting a mailbox and choosing Mailbox → Synchronize (where available) can speed this up. The activity indicator next to the account in the sidebar disappears when it is done.

Step 2: Export the mailboxes

1. In the Mail sidebar, select the mailbox you want, for example Inbox. Hold ⌘ to select several mailboxes at once. Selecting a parent mailbox also lets you include its submailboxes.
2. From the menu bar choose Mailbox → Export Mailbox… (you can also right-click the mailbox).
3. Choose a destination, for example a new folder called Mail export on your Desktop, and click Choose.
4. Repeat for every mailbox you want to move (Sent, Archive, your own folders…).

For each mailbox, Mail creates a folder such as Inbox.mbox. Inside are a file called mbox (your messages) and small metadata files such as table_of_contents and Info.plist. Finder may show the .mbox folder as a single item; that’s normal.

Step 3: Convert to PST

1. In MoveMyInbox, start a New conversion.
2. Drag the exported .mbox folders (or the whole Mail export folder) onto the upload area, or click Choose a folder. We find the mbox file inside each one, skip the metadata files and name each mailbox after its folder, so Inbox.mbox/mbox shows up as Inbox.mbox.
3. Keep Folders set to One folder per mbox file: every exported mailbox becomes an Outlook folder with the same name (without .mbox).
4. Upload, pay if needed, and download your PST when it’s ready.

Next step

Now import the PST into Outlook, on a Mac or on Windows.