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There are many ways that will help you to convert OST to PST free manually such as:
1. Using import/export feature- It is a most common way to convert the data manually.
2. Drag and Drop Method - It is used to convert limited data only, as it won’t be effective in converting large files.
3. Archive Feature - In this way you can auto-archive OST files which will automatically save data in PST files.
Remember one thing that these manual methods sometimes fail to convert the data and are time consuming as well. These reasons made users switch to third party tools like Datarecovee to convert OST files to PST.