There is no direct or manual method available by which one can recover email from OST file outlook and even except the automated tool no other alternative supports the latest outlook edition.
So, one has to depend on a third-party tool like SysInspire OST to PST converter. It helps to export all items from an OST file into PST format, then it can be easily opened in any Outlook account.
It also helps the users to convert OST to PST in Outlook 2016, 2013, and other lower versions.
Just a few techniques are to be followed like downloading and then installing the SysInspire application. Then after unlocking, move further accordingly to the instructions given. After completion of all the phases, you can appropriately recover the OST file and then get it export in MS Outlook 2016.
Now, check the process to recover emails from the OST file data into PST file format.
Download, and Install the SysInspire OST to PST file converter on your PC
Open the application and expand the OST files which you want to convert by clicking on the “Add OST Files / Folders” button (You can select multiple OST files at a time)
Next, choose a proper location to save the PST files after conversion.
Now, click on the “Convert” button and let the conversion process finish.
More info:- Recover email from ost file outlook 2016