Manually converting OST files into Outlook is a challenging task. However, you can easily perform MBOX to PST conversion using third-party software. Softaken MBOX to PST Converter software is a perfect solution to convert MBOX to PST format for Outlook. The software can convert multiple MBOX files in a single attempt. It preserves data integrity and folder formatting as well during the process. You can download its free trial edition to check its work performance. Refer: https://www.softaken.com/mbox-to-pst-converter