You can try SysInspire OST to PST Converter Tool top-rated software to import an OST file and then transform them into Outlook PST file including all the mailbox contents such as the email, contacts, calendars, notes, tasks, etc. with easy mitigation.
The smart preview feature of this software will help you to get a detailed preview of your OST mailbox before final import of the OST files to a new PST file.
Being a professional tool, it keeps the original OST data intact during the entire import process.
To import OST File into Outlook have a glance at the following steps:
Step 1: Download and Install SysInspire ost to pst Software for Importing OST File in Outlook.
Step 2: Run the software and click on the Open button to select an OST file.
Step 3: Now select Scanning mode to handle both the normal as well as the corrupted OST files.
Step 4: Click on the OK button when the scanning process is completed.
Step 5: Now preview the OST mailbox before final importing into a PST file.
Step 6: Click on the Save button and select the folder path to save the imported OST file.
Step 7: Click on OK to convert the OST file as a PST file.
Step 8: The selected OST file is successfully imported into a PST file.
More info:- OST to PST Converter