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Outlook OST files cannot be directly opened in Outlook so converting them to PST a more manageable format is the best feasible option however this is not as easy as you'd think. Let's have a look at some of the options that we have to accomplish OST to PST Conversion.
Steps to export OST to PST
For this one to work you should have Outlook setup and running on your machine.
Open Outlook
Go to File -Open and Export- Import/Export
Select "Export to a File" from the window that opens and click on Next.
Select Outlook Data File(.pst) and proceed.
Select the location where you want to keep the PST files.
There is no guarantee that this method will work especially if the OST heavily corrupted. This method has however its flaws like needing to be connected to the exchange server, if the file is inaccessible it won't work and if any error crop up like Outlook refusing to open, it'd take a great deal of technical expertise to get around.

Best Solution is ost to pst converter free download full version

In order to overcome the discussions mentioned above it is better to make use of a tried and tested OST Recovery solution like EdbMails OST to PST Converter that can easily recover and all information in your OST file to PST files and that too quickly. It doesn't alter the content of the original OST file under recovery and also provides extensive filtering options by to/from address, data, subject etc