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One of the safest ways to convert OST files to PST is by using a professional OST to PST Converter. This software approach is recommended by many experts in this industry. Also, it is a reliable solution to export multiple OST files to PST that are stored in your system. In this regard, I have recently explored an informative article to find the solution to this issue. Fortunately, this article explains the two different approaches to accomplishing this task. 

You can also perform the OST to PST file conversion by using the manual approach. However, there is only one restriction you can only convert OST to PST of your current Outlook profile. This method is suitable to backup your Outlook data in case of transferring the file or to secure your crucial business information from unwanted circumstances. To know more, I recommend you to go through this informative article. It will definitely clear your confusion regarding the whole process of how to convert OST to PST format.