05-06-2026, 07:24 AM
Yes, you can migrate IMAP emails to EML files with attachments intact, but the outcome depends on the method you use. Most desktop email clients such as Mozilla Thunderbird allow you to add an IMAP account, sync all folders, and then drag and drop messages into local folders, where they can be exported or saved as .eml files with attachments preserved. Outlook can also be used by configuring IMAP, downloading mail, and using save-as or export options, though it may require add-ins for bulk EML export. Attachments remain intact when messages are exported correctly because EML format stores the full MIME structure of each email, including embedded and attached files. Avoid unreliable converters and always verify a few sample EML files after export to ensure attachments open properly across different email clients like Thunderbird, Outlook, or Windows Mail. For large mailboxes, consider splitting exports by folder or date range to maintain performance and organization and avoid data loss issues risk.