To migrate Outlook OST files to PST format, eSoftTools OST to PST Converter software offers a simple and effective solution. First, download and install the software. Once installed, open it and select the OST file you want to migrate. After selecting the file, you can preview its contents. Choose the PST format as your desired output and click "Convert." The software will migrate all your data, including emails, contacts, and attachments, into a PST file, ensuring data integrity and a seamless transition.