Use the best and reliable software is
ZOOK OST to PST Converter to Export OST Emails to PST format for Outlook. The tool enables user to access orphaned, IMAP, cached, crashed OST file into PST format which allows user to open OST file in Outlook. The tool can easily support all the latest versions of Microsoft Outlook i.e. Outlook 2016, 2013, 2010, 2007, 2003, etc.
Check for more details at:
Export OST files into PST Format