Like any other file, OST files can also be the subject of corruption, and an app such as vMail OST to PST Converter can come in handy in recovering them and converting them in an easier to read format. Having all the data on your hard disc comes with the added benefit of allowing you o access all of your emails and attachments even when you temporarily lack Internet connection. They are all the account related data, such as contact info, emails, and attachments, all stored in a single file on your hard drive. OST files are proprietary file formats that appeared along with the latest editions of MS Outlook.
