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Hi Ashish,
There are several manual methods present convert OST files into PST file formats such as:
1. Archiving Method.
2. Drag and Drop utility.
3. Import/Export Wizard.

But you are asking for the best method, so you can go with a OST to PST Converter from SysInfotools. It is an exceptional tool that supports multiple conversion in just one step and overcomes all the limitations of manual methods. The demo version is also available.