Approximately a PST file can be opened by outlook. But an ost file can be imported into Outlook 2013 or 2016 or the other versions.
To prevent the corruption and manhandling of the files, the most fundamental option is to import the OST file to Outlook.
Instantly, the manual method is not so acceptable, so the third party tool software is helpful.
SysInspire OST to PST converter software is the smart technology that simply within a few steps can convert OST files to PST.
Download, install and operate SysInspire tool on your PC; then Select “Convert OST”, now opt for “Browse” and select the OST file which desires to be imported.
In just a few minutes, the OST file you have chosen will be imported to a PST file.
More info:- Import an ost file into outlook