I would like to suggest here one of the powerful solutions
OST to PST Converter Tool to convert all data from Outlook OST to PST file format. This OST to PST Converter Software effectively retrieves and converts all OST data to PST formats like emails, contacts, notes, calendars, journals, etc. The user can also convert OST data files into PST, EML, EMLX, MSG, MBOX, and VCard file formats. This application is supported by MS Outlook 2003, 2007, 2010, 2013, 2016, 2019, etc.