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MacSonik Maildir Converter is the finest option . In addition to many other file types, the software can convert Maildir to PST, EML, PDF, HTML, and MBOX. Users of Office 365, Gmail, AOL, Hotmail, Yahoo Mail, and Thunderbird can export emails and folders of Maildir and Maildir++ files. Emails including attachments can be converted or exported with no data loss.
