If you don't want to use any third-party software then you can solve your issue related to the OST to PST Exportation tool with the help of non-manual solution as they are free also. You can avoid the third party software. It offers a much-anticipated solution for many people who were tired of looking for a direct application, and instead, all they got were inferior OST to PST Exporter tool. You could give a trial version a shot! It allows you to test all the features with no restriction except the limitation on the number of exportation.
Visit here:-  https://www.betavare.com/ost/pst/

The Betavare OST to PST Exporter Software carefully filters and configure outlook files to save a healthy PST file by taking out all email folders such as- Inbox, Outbox, Sent Mail, Journals, Draft, Notes, Tasks, Contacts and other. Through this tool Recover OST file to safely exportation OST to PST file with successfully works on exchange OST file version- 2000, 2003, 2007, 2010, and 2013. 2016. It offers a much-anticipated solution for many people who were tired of looking for a direct application, and instead, all they got were inferior OST to PST software tool. 
Visit here:-https://www.betavare.com/ost/pst/