To recover data from an orphaned OST file, you need to convert it to PST file. But Microsoft provides no tool to perform this conversion. There are third party tools available to convert orphaned OST file to PST file. One such tool is available at http://www.convert-osttopst.com you can try it's demo version for free. That will preview all the recoverable components for free.
http://www.datanumen.com/aexr/compare.htm
ALl these tools should provide a free demo so that you can try before you buy.