I would suggest you try VOOK OST to PST Converter for the instant migration of the bulk OST emails to PST format. It supports all the MS outlook editions so that users can efficiently switch the data to PST format. This utility has a simple and intutive GUI interface. The users can easily export unlimited OST emails in the batch form with all the attachments embedded in it.
The best OST to Outlook Converter retains all the meta data and RTF formatting of the files intact even after the conversion process. It can smoothly migrate the corrupted OST emails without the installation of MS Outlook.
To know more visit:- http://vooksoftware.com/ost-to-pst/