Adding OST file to Outlook with the help of OST to PST Converter software. It is one of the best tools that helps you to convert bulk OST files to PST file format with all emails, contacts, calendars, tasks, notes, and, etc. without any data loss. It has a very simple GUI, anyone can easily handle and works with the software without having technical skills. MS Outlook installation is not required for the conversion process. During the process, the tool keeps all the folder structure without any changes and data loss. It supports all the latest and below versions of MS Outlook and Windows OS including Windows 11. Demo version of the software also provided without any cost.