Convert OST files to multiple formats including PST, EML, MSG, HTML, PDF, MBOX, and vCard using SysTools OST Converter software. The user can download this software on Outlook 2019 and earlier versions.

In addition to exporting your emails, contacts, calendars, and more, SysTools OST Converter is also capable of handling various types of OST files, including those from IMAP, Office 365, Exchange, and Hotmail. The app even supports corrupted, orphaned, or inaccessible OST files, so you can still retrieve your data even if the file is damaged.
One of the standout features of SysTools OST Converter is its ability to remove and decrypt OST file encryption for conversion. If your OST file is encrypted with S/MIME or OpenPGP, this program can help you bypass those encryptions to ensure successful conversion.
The program also includes two scan modes - Quick Scan and Advanced Scan - to give you more control over the conversion process. And if you're concerned about maintaining the folder hierarchy of your files, don't worry - SysTools OST Converter has you covered.
Once you add your OST file to the program, you can preview your items before exporting, with seven different preview modes to choose from. And if you're not ready to commit to the licensed version, you can try out the freeware version to export the first 25 items per folder.
Overall, SysTools OST Converter offers a simple, user-friendly solution for converting your OST files to other formats. With compatibility for Microsoft Outlook 2019, 2016, and 2013, you can trust that this program will work seamlessly with your existing software.
Version 5.0: Updated with OST to MBOX and vCard