If You don't know how to convert OST to PST files then grab best EmailsGuru OST to PST Converter application to convert single or multiple OST files to PST files without any extra efforts. It supports all editions of MS Outlook including all new to older version of Outlook 2013, 2010, 2007, etc. The software is facilitated with user-friendly interface which is suitable for technical as well as professional users. This tool convert OST files including emails, contacts, notes, tasks, inbox, sent-items etc.
for more info: Migrate OST to PST files