There are lots of third party tools which can convert OST to PST files. But This OST to PST Converter software is one of the best solution to safely converts all mail items of Offline folder (OST) file and saves them in new Outlook PST file, along with giving option to save as EML, MSG, RTF, HTML file formats.
Best techniques to recover and convert Offline .ost database into outlook.pst extension without modifying internal content and attachments. It can support all versions of 97, 98, 2000, 2003, 2007, 2010, 2013 and 2016.
Read more:- http://www.osttopstconverter-tool.com/