I tried manual process but doesn't open my OST file into Outlook. Open MS Outlook. Click the File menu. Select the “Import and Export” wizard or press 't'. From the list, click the “Export to a file” option and then click Next button. Select Personal File Folder (.pst) and then click Next button. How to Restore Emails from OST file Outlook 2013? Posted by hirussellsmith in hirussellsmith's Blog on May 29, 2018 3:04:00 AM MS Outlook 2013, like earlier Outlook versions, uses OST file to save a local replica of Exchange mailbox data. How can the answer be improved?