If you are finding for an easy solution to migrate Email to another file format then you must use Email Migration software . This tool is used to transfer or migrate email messages and other components such as attachments, calendars, contacts, tasks, and notes from one email system to another. Migration tools can be used to move emails from different email clients to other email clients such as Microsoft 365, or from one cloud-based system to another. Migration tools are often used to move large amounts of email data quickly and securely and can be used to migrate data from most current email clients including Microsoft Exchange, Outlook, Gmail, and Apple Mail. You can also try its free demo version to check its features.