Import .CSV file into Yahoo! mail?

Is there a way to import a .CSV file into Yahoo! Mail that contains all my emails? As I set up Outlook, and it deleted all everything in my inbox on Yahoo! mail, so i created a backup (.CSV) and was hoping i could import back to Yahoo!, thanks.
Update: Oh yeah, I'll just copy and paste all 4000 emails, won't take too long </sarcasm>.
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