I as an approximate value refer the SysInspire OST to PST converter software to be the apt free OST TO PST converter. I had searched for various third-party tools to quickly convert my files
Then, I have suggested the SysInspire OST to PST converter software.
This refined application preserves all your Mailbox, Contacts, Tasks, Calendar, Notes and Journal.
The steps to be followed for offline ost to pst conversion are:
Step 1: Download SysInspire free offline OST to PST Converter and Install and operate it on your system.
Step 2: Click on the Add OST Files button
Step3: Utilizing the Add option and Search button, add required OST files and check them.
Step 4: Make a right-click on selected files or click the OST to PST button of the ribbon bar and go with the “Save all Files in Outlook PST” option
Step 5: Now, you will be induced to apply the filter using Process Message Class and Process Item Date Range. Click the Next Button.
Step 6: In this page, users have the option to choose if a user wants to migrate in an existing PST or wants to create a new PST and wants to migrate in it.
Step 7: The conversion of OST to PST proceeds now, after successful conversion, a message “Process Completed Successfully” will appear, click Ok.
The SysInspire tool can convert multiple OST files into PSTs through a single batch process.
More info:- https://www.sysinspire.com/ost-to-pst-converter/