DRS OST Converter software is one of the best tools to convert your files. This software also contributes users with the conversion of OST files into multiple other email clients or file formats. The utility is designed with innovative functionalities and does not require any manual skill to run this. You can install its free demo version and check its functionality.
Convert OST to PST Manually
Open Outlook and go to the File menu.
Select the Import/Export option.
Choose Export to a file.
Select Outlook Data File (.pst)
Choose whether to export a specific folder or the whole account.
Check the Include subfolders box.
Next, select a destination for the Export, and then click Finish.
Regards,
Peter