Firstly Download the Software to view .ost file, then follow the below Steps
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Step 1.
After Downloading, Launch the Program on your computer screen then Click on Select PST file Button-
Step 2.
After Clicking on Select .pst file button, go to the drop-down list of File type and Choose the .ost file format -
Step 3.
Browse the Location & Select OST file from where you saved them -
Step 4.
After following the Instructions as in Step 3, you will see your all .ost files data –