If you want to open an OST file in Outlook, the best approach is to convert it into PST format using eSoftTools OST to PST Converter Software. Since Outlook does not allow direct access to OST files, this tool helps you easily convert OST data into a PST file that can be imported into Outlook. It safely recovers emails, contacts, calendars, and attachments while maintaining the original structure. With its simple interface and quick process, users can open and access OST file data in Outlook without any hassle.