Using third-party software is often the most efficient and reliable way to convert OST files to PST format—especially when compared to complex manual methods. While there are many options available, it's important to choose a trusted solution based on performance and user feedback. One such tool is Goldytools MAC OST to PST Converter.

This powerful application enables you to convert large batches of OST files to PST format in just a few simple steps. Designed with user-friendliness in mind, it requires no technical expertise, making it accessible for both beginners and professionals alike. The software is fully compatible with all versions of macOS and Microsoft Windows, ensuring broad usability.

To help you get started, Goldytools also offers a free demo version, allowing you to explore its features and performance before making a commitment.
https://www.goldytools.com/blog/how-to-convert-ost-to-pst-format-with-goldytools-ost-to-pst-converter/