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I have also suffered this issue then my friend suggested me try this PST to Office365 converter tool and I got a great result.so I suggest you try this software. This software converts all data of the PST file into Office365 format. Here Your all data are safe if the users convert their valuable data with this application. it is easy to use and 100% secure. No data damaged or lost during conversion.you can download its trial version first, the trial version converts few items from each folder.you can download this tool from here:-https://www.osttopstapp.com/pst-to-office-365.html