If the user wants to restore the ost file, then don't go here and there, just move to the SysInspire application official website and download the SysInspire OST to PST application for restoring the ost file.
You can easily restore the deleted mailbox contents like the emails, journals, calendars etc. from the ost file because this application has inbuilt restore and also the backup capacity to revive the lost items from the ost file and thus restore all deleted ost files along with their inherited attachments. You can also backup the ost file if required.
So, give it a trial to the ost to pst converter tool by SysInspire. With the help of this third party OST to PST Converter tool, the user is liable to open each variety of components of Outlook files including emails, contacts, calendar events, journals, etc. with their attachments into PST file format.
Follow the steps below to restore the ost File database
launch SysInspire software to open the Outlook ost File, and launch it.
Select the scanning mode to scan the mailboxes from the ost file that you want to be recovered.
Click on the Next button to move in the ost file and then press on the save as the pst options.
After that click on the Next button.
Now, open MS Outlook to explore the ost file and check whether the file is properly restored or not.
More info:- Backup and restore ost file