To migrate emails from HostGator to Office 365, users should use eSoftTools IMAP Backup & Migration Software. This software migrates your emails to Office 365 very quickly. Its graphical user interface is very friendly, which makes it easy for non-technical users to use it. Also, this software can backup your IMAP emails in PST, MSG, HTML, MHTML, EML, EMLX, MBOX, and other files. This... https://www.esofttools.com/imap-backup-migration-tool.html