Opening an OST file in Outlook is also quite easy using the
eSoftTools OST to PST converter software, which I've used myself. The tool's features are quite useful, and it offers two options: opening a single OST file or opening multiple OST files simultaneously in Outlook. You can also use this tool to open OST files in any email cloud, such as Yahoo Mail, Gmail, Office 365, and IMAP.
Furthermore, the tool's user-friendliness makes it easy for any user, whether technical or non-technical. The tool can be downloaded and run on all versions of Windows. After downloading, you can also use the free demo provided with the tool, which allows you to open 25 emails in Outlook for free.
Read More:- Open an OST file in Outlook