Many users want to fix issue of Outlook OST cannot be opened error, and they want permanent solution. If they searching on internet about solution but they did not get the best tool, that's why I suggest you download SysInspire OST to PST converter software. This tool can convert OST file into multiple file format such as OST to PST, EML, EMLX, Yahoo Mail, Gmail,etc. It has more than 10+ file formats. It show the live preview of OST file before conversion. It has a demo version that can allow users to convert 25 items from each folder of OST for free. After using the demo version of the tool then you can use the paid version of the tool.
You could really try the eSoftTools OST to PST converter tool, which is very useful and can be downloaded from eSoftTools; it can transform your OST files to various formats, such as OST to PST, EML, EMLX, Office 365, HTML, Yahoo mail, and so on. This is the most secure and virus-free tool for you; you can filter your emails using the search box; it has a Bulk conversion feature; you can convert your OST files in bulk at the same time in one click; and you can download the Demo version of this software. It is compatible with all versions of the operating system for Windows. It offers technical support 24 hours a day, seven days a week.