To import ost file in outlook 2016
Launch the SysInspire OST to PST Converter onto your system.
Click on Open from the screen and then click on Browse.
Select the OST file which you want to import into PST format and click on Open.
Select the suitable scanning process.
Now OST files details are displayed and other options. Click OK to start the scanning process.
You can now check the preview of their mailbox content. Select the mailbox folders which you want to save into the PST file.
Now, browse to select a location for the new PST file and click OK to start the conversion.
The OST to PST import is being done on your System.More info:- Import ost file in outlook 2016