There is no option available for directly importing PST files into Outlook 365 at this time. If you need a speedy solution, then you may try out another third-party program that can help you import PST to Office 365 straight ahead, complete with all of the data attachments.
Shoviv PST to Office 365 migration utility to Office 365 directly import PST files into O365, preserving all of the file’s metadata in the process. We have shared some of its features which are as follows:
Complete PST-Office 365 migration:
It migrates PST files to Office 365 mailboxes without size or quantity restrictions. It allows numerous mailboxes and folders for easy transfer.
Data security and integrity:
The software preserves folder structure, email attachments, and metadata during transfer. It protects critical data during migration with sophisticated security.
Export and resume incrementally:
The tool’s gradual export capability lets you pause and continue migration without losing progress. This is useful for huge migrations or disruptions.
Duplicate detection/prevention:
Shoviv PST to Office 365 efficiently removes duplicate emails during transfer, reducing clutter and ensuring data accuracy.
Therefore, you should also test it out using the free demo it provides and become familiar with how to import a PST file into Outlook 365.