It is true that Office 365 provides a variety of features that makes our work easier and valuable. If you are looking to import PST file to Office 365 then you must take the help of MailsDaddy PST to Office 365 Migration Tool. This is one of the effective solutions to import PST to Exchange Online by customizing the migration process in your own way or requirement.
Know more about the tool: https://www.mailsdaddy.com/pst-to-office-365-migration-tool/
You may also use the manual process instead of adopting this professional solution for Office 365 Import PST service. This also allows migrating your on-premise Outlook PST file to O365 accounts successfully with all its mailboxes including emails, contacts, tasks, attachments, etc. To learn more about the manual process you may visit here: https://cupertinotimes.com/how-to-import-pst-mailbox-items-to-office-365-without-outlook/