Two Free Methods to Convert OST to PST File
https://www.nucleustechnologies.com/blog/free-methods-convert-ost-to-pst-file/
When the tool displays the OST file content, you can choose a folder and view its content in the preview pane. To convert the OST file into PST, click the Save option on the toolbar. To save in PST, click PST file (MS Outlook) as the Output type. Select the filters – From, To, Subject, Folder name, Item type, and Date range.
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