The two most commonly used formats under the broader head of email management are Maildir and PST. The former is often seen and associated with the Mail Client on Linux-based email servers like Postfix, Qmail, and Dovecot. PST, on the other hand, is a proprietary file format used by Microsoft Outlook to store emails, contacts, and other mailbox items. http://www.articles.studio9xb.com/Articles-of-2024/free-solution-convert-maildir-pst-format