The OST files are in an offline Outlook database and cannot be used online, so you need to convert them to online PST format. In this regard, you can use the manual technique, but it is a very strict and time-consuming process, so you can use the OST to PST converter software that easily converts damaged or damaged OST files to PST format. It easily converts OST data files including emails, contacts, memos, memos, magazines, etc. Users can preview OST files in real time before conversion. It is a well designed and intuitive utility with support for all versions of MS Outlook.