You can Manually convert OST to PST by exporting the data from OST file. Check out the steps
- Open Outlook>>Go to File Menu
- Click on Account settings and Create New, A new PST file will be created.
- Now copy the contents of your OST (offline Storage Table) file to new PST file.
This way you can export files from OST to PST Manually for free. If you want to instantly convert OST to PST then use OST to PST converter. Here are some of the Best OST to PST converter.