Migrating an Outlook OST file to PST is easy with eSoftTools OST to PST Converter Software. First, download and install the software. Then, select the OST file you wish to migrate. The tool will scan the file and display a preview of the data. Choose PST as the output format and click "Export." The software will migrate your data from OST to PST, preserving all emails, contacts, and calendar entries without any data loss. The migration is quick and secure.