We recommend you using our OST to Office 365 Restore software. The software is the best solution to all your problems as it provides faster conversion and import recovered mailbox folders from .ost file to Office 365. It helps the user can apply filter messaging and OST splitter and can perform the import of selective items from OST to Office 365 user account.
Get more information it: http://www.recoverymails.com/convert-ost-to-pst.html