Sometimes, it happens the user might have accidentally deleted their important Exchange mailbox and at the same time has not taken any recent backup of the ost files.
The perfect solution recommended in such a strategy is using a third-party solution like SysInspire OST Recovery to recover the emails from OST file Outlook versions like 2016.
Follow the quick steps one by one mentioned below to recover the emails from the ost file:
STEP 1: Launch SysInspire OST Recovery Software and click Browse to select OST file for recovery.
STEP 2: You can select a single as well as multiple damaged OST files from your PC local drive for recovery.
STEP 3: A complete preview of OST file items is displayed by the SysInspire OST recovery software.
STEP 4: The email items are saved singly by right-clicking on the specific email.
STEP 5: Select the PST file as Output to save the complete recovered data. You can also choose any desired output type as per your requirement from the saving options like the box, vcard, etc.
STEP 6: Finally, select the desired location to save the recovered OST mailbox data to the PST file on your desktop.
More info:- Recover email from ost file outlook 2016