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No, iCloud Mail does not officially support direct MBOX file import through its web interface. Apple’s import feature mainly supports importing emails from other email providers rather than uploading standalone MBOX files directly.
To move MBOX emails into iCloud Mail, most users use Mozilla Thunderbird or Apple Mail as an intermediate application. The MBOX file is first imported into the email client, then synced to iCloud Mail using IMAP.
From my experience, this manual method works for smaller mailbox transfers, but large MBOX files can take longer to sync and organize properly.
For a more efficient migration process, the BLR MBOX Converter Tool can help transfer MBOX emails to iCloud Mail while preserving attachments, formatting, and folder hierarchy.
So, while iCloud Mail itself doesn’t directly support MBOX uploads, there are still reliable ways to complete the migration safely.
To move MBOX emails into iCloud Mail, most users use Mozilla Thunderbird or Apple Mail as an intermediate application. The MBOX file is first imported into the email client, then synced to iCloud Mail using IMAP.
From my experience, this manual method works for smaller mailbox transfers, but large MBOX files can take longer to sync and organize properly.
For a more efficient migration process, the BLR MBOX Converter Tool can help transfer MBOX emails to iCloud Mail while preserving attachments, formatting, and folder hierarchy.
So, while iCloud Mail itself doesn’t directly support MBOX uploads, there are still reliable ways to complete the migration safely.