If you are facing any problem to open the OST file in outlook? I recommend you to use the SysInspire OST to PST Converter Software to open your OST file in outlook. This software helps you to convert your bulk OST file into multiple PST files and this software is easy to use for technical and non-technical users. It allows for complete conversion of the OST Mailbox without any alter in present data. It provides you with a free demo to save 25 items from every folder of the OST mailbox.