Outlook users often need to convert OST file to PST format. This can be done through manually. Here are some simple steps:
1. Open Outlook, go to File > New > Outlook Data File, and save it as a PST.
2. In the OST file, select emails/folders, right-click, and choose "Copy."
3. Navigate to the new PST file and paste the copied items.
4. Close Outlook, and your PST file will be ready.
If you found out this method complex and time consuming then you can take help of fully automated
EmailsGuru OST to PST Converter. It is dedicated tool to convert OST file to PST format including emails, contacts and attachments. New users can also checked out free trial version.