vMail for Office365 Email Migration Tool is best tool for migrating data between cloud platforms. The vMail for Office365 Email Migration Tool export your O365 mailbox to a variety of file formats including PST, OST, EML, EMLX, MBOX, MSG, CSV, HTML, PDF, MHTML, TXT, DOCX, DOCM, and DOC. More info- https://appsource.microsoft.com/en-us/product/saas/vartikasoftwareprivatelimited1702907737065.vmail-office-365-email-migration-tool?tab=Overview