MailsDaddy PST to Office 365 migration tool is the best GUI-based application to load and migrate data from PST to Office 365 account at once. The software supports ANSI and Unicode PST files so users can migrate both types of mailboxes at the same time.
If you have multiple mailboxes then you can also use the software and open emails in a PST file. The demo version of the software converts 20 emails from each mailbox.
Get more detail: https://www.mailsdaddy.com/pst....-to-office-365-migra
Manual: https://www.mailsdaddy.com/blo....gs/how-to-import-pst