OST to PST conversion toolAs far as I know, OST files are protected, so the only way to turn them into PST files would be to first log in using the original MAPI, then open the OST file in question and finally export it to the PST format. I know that this method isn't that convenient, but it's guaranteed to work. Alternatively, there's a tool called OST PST conversion tool that boasts about offering exactly the functionality that you're looking for, but I haven't tried it for myself, so I can't guarantee that it will work.
OST PST conversion tool provides premium ost pst conversion services for all users worldwide, this application is really easy to use and features a friendly interface. Besides the conversion itself, you may apply OST PST conversion tool to fix data corruption problems in ost or pst files, this powerful data recovery service can be launched on any PC, it allows recovering email folders without the assistance of other engineers and third party services. Besides, the size of OST PST conversion tool is really small that is why this program can be applied by anyone without the access to fast Internet links. All you need is simply open the website of Recovery Toolbox, Inc. and get the setup file of ost pst conversion program, it can be done in several seconds. As soon as the installation is completed, you may click the shortcut of OST PST conversion tool and follow the instructions of email recovery program. It should not be complicated even for beginners, just follow the guidelines of OST PST conversion tool and proceed to the analysis of Microsoft Outlook files. For this purpose you should click the open file softkey and select a file of ost or pst format to be processed. Please do not worry about the safety of selected file, OST PST conversion tool does not modify the data, stored in these documents. Double check the path as soon as it is selected to avoid the wasting of your time and make sure you are going to open exactly what it is needed. Click the Next button to proceed and initiate the analysis of Microsoft Outlook folders, it may take some time according to the size of input documents and to the performance of selected PC. Fortunately, the network support of OST PST conversion tool allows selecting any PC in the local area network for the analysis of Microsoft Outlook files. However, it does not make sense if you are not going to restore corrupted documents very often.