If you are looking for an good OST to PST Converter then I would suggest you to use EmailsGuru OST to PST Converter to retrieve your data from corrupted OST files. This tool will instantly export OST files into PST format in bulk. Even non-technical users are capable to operate this tool smoothly because of its user-friendly GUI. Users can split big OST file into multi micro PST files according to their situation. Users can download trial version of this tool at free of cost.
for more info: OST to PST
for more info: OST to PST