You can import Outlook OST files to Windows 10 Mail app with the help of eSoftTools OST to PST Converter software. This method provides OST to PST conversion while maintaining the original structure and integrity of your mailbox, ensuring no data loss and smooth migration. Install its free trial version to avail other features of this software.
Read more- Import Outlook OST File to Windows 10 Mail
Read more- Import Outlook OST File to Windows 10 Mail