Some conversion programs allow you to save IncrediMail message files in other formats; however, to import the messages directly into Outlook, choose the PST format.

How to import an Outlook backup .pst file Open your Outlook 2016 for Windows desktop app. Click the File tab at the top-left of the screen.

If you’ve saved all your Outlook emails through a backup file, then you’re probably left wondering what to do with it. Fortunately the way to get those files back into Outlook is pretty simple.