The best solution for recovering OST files in Outlook is eSoftTools OST to PST Converter software, which offers a range of valuable features. Also, this software is available in many languages, so anyone can easily use this tool, and using it, you can convert contacts, emails, calendars, notes, etc. Apart from this, using this software, you can also recover OST files in Gmail, Yahoo Mail, and Office 365. There is no data loss when recovering OST files with this tool. It also has a demo version, which makes users even more confident about this software.