Yes, you can convert multiple OST files to PST in bulk with the help of Advik OST to PST Converter. The software has a dual mode that enables you to export single or multiple OST files in one go. It preserves data integrity and mailbox folder hierarchy during the OST to PST conversion. The tool is designed in such a way any novice user can easily use it without any technical knowledge. You can download its free demo version to check its working procedure.