Try eSoftTools Outlook PST Recovery Software can import Outlook PST to Office 365. That also can convert between the ANSI and UNICODE file formats. While converting, it shows a live preview of emails, diaries, contacts, notes, and calendars, among other things. In the free trial version, you can convert up to 25 emails per folder.
Get more information:- import Outlook PST to Office365
You can use either a manual method or a third-party solution to convert PST files to Office 365 mailboxes. There are a lot of programs on the internet market, but evaluating each one is difficult. So I propose utilizing a third-party tool such as SYSessential PST to Office 365 Migration, which I recently tested and found to be a speedy and secure way to convert PST files to Office 365.