Using a reliable third-party tool is often the most efficient and hassle-free way to convert OST files to PST format—far more effective than relying on manual methods. While there are many converter tools available, it's important to choose one based on performance, reliability, and user feedback.

One such trusted solution is the GoldyTools OST to PST Converter. This software allows you to convert multiple OST files to PST format in just a few simple steps — no technical expertise required. It’s fully compatible with all versions of Windows and macOS, making it a flexible choice for users across different platforms.

Additionally, GoldyTools offers a free demo version, so you can explore its features and functionality before making a purchase.
https://www.goldytools.com/blog/convert-ost-to-pst-file-format-in-simple-steps/