As far as I know, many solutions are available on the web, which provides ways to import PST files into Office 365. And PST to Office 365 Migration tool is one of them that provides an easy way to import PST to Office 365. Before going with the full version, one can make use of the trial version of this tool. It has a few and easy steps to import PST to Office 365.
Step-1. Download PST to Office 365 Tool
Step-2 Open tool and Click on Browe Button
Step-3. Select your PST file
Step-4. Import PST to Office 365 account.
Read in Detail: https://www.bitdataconversion.com/pst-to-office365.html