If you are looking for solutions to migrate OST files into PST then you can try CloudMigration OST to PST Converter. This software enables users to convert data from OST files into any other file format and also in multiple email clients. It is an advanced utility that does not need any special skill. This software is very easy to use and also protects data from corruption. You can try out its free demo version and check its efficiency.
Read More - https://www.cloudemailmigration.com/ost-to-pst-converter.php