To import OST mailbox data to Outlook PST file, I would like to refer a third party solution, known as, Export OST to PST. The software is also capable to recover data from corrupt or damaged OST files. With the help of this 3rd party software, users can also save the recovered data into EML, MSG, RTF, TXT, MBOX, DBX, HTML and MHTML file formats. The software also supports all MS Exchange and Outlook (including 2016) versions. For more information, visit- http://www.exportosttopst.ost2pstexe.net