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Regain PST to Office 365 Converter helps you export PST files, contacts, and calendar contents to Office 365 files. It has no bar on adding PST file size; we have successfully evaluated the tool with up to the maximum size of PST file.
https://www.regainsoftware.com/pst-to-office365-migration.html
Read more info: https://www.regainsoftware.com/blog/how-to-upload-pst-to-office-365/