OST to PST conversion is not possible as there is not a manual method available. Users do face the problem with OST files & with the demand of PST files, it is always better to convert OST to PST files. The converter would allow to detect the OST files without any problem. The converter PST files would get opened in every version of MS Outlook. There would be no loss of data when the conversion process would get finished. You can use the trial version of the tool which can only convert 25 mails at once. Try this OST to PST Converter to get complete conversion of OST files to PST file format.
Pentium II 400 MHz, 64 MB RAM, Minimum 10 MB Spaceconvert ost to pst