How to perform OST convert to PST? is the most asked query of Outlook users. Some reasons for users to convert OST to PST are Maintenance of the Exchange Server, backup of OST files, protection from external threats, etc. You can change OST to PST using Manual Methods like the Archive feature and Import/Export Feature. If the manual methods can't solve your problem, you can try the third alternative, which is Professional Approach. To know more about all these methods and steps read the post further.