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Best Answer: With the all-new Yahoo Mail, there is no option to import pst files. However, in the Yahoo Mail Classic the only thing you can import are contacts in the address books. Here are the steps to do import/export of contacts: 1. Choose a program to import contacts from: Yahoo! (.CSV file)
Open Outlook. Select the File menu then select Import and Export.. Select Export to a file.. Click Next.. Select Personal Folder File (.pst) from the list and click Next.. Highlight the message folder you want to export. Check the Include Subfolders box if you wish to export messages from the subfolders.Click Next.. Select Browse in the Save exported file as pop-up.Type a file name in the file text box.elect the File menu then select Import and Export.. Select Export to a file.. Click Next.. Select Personal Folder File (.pst) from the list and click Next.. Highlight the message folder you want to export. Check the Include Subfolders box if you wish to export messages from the subfolders.