Got amazing software to work with i.e. free OST to PST Converter is the great way. The tool is so fast and reliable that it takes a few moments to convert a batch of OST files to Outlook PST format and maintains the integrity of data. Immediately download the Demo version of software that converts first 30 mails to the Outlook format.
Steps the convert OST to PST Outlook-
• Launch KDETools for OST to PST converter tool.
• Open “Browse” to add the OST file or folder.
• Show Preview the whole data items before saving.
• Click the split option to divide large PST files.
• Messages Filter OST file.
more info- http://www.osttopst-converter.com