A client of mine still has a computer running Microsoft Outlook Express and they wanted me to import the address book contacts into their Yahoo Mail account. At first I was a little worried that Yahoo Mail may no longer support the format of Outlook Express address book contacts but then I remembered that you can export contacts into a CSV (Comma Separated Values) file which means I could manipulate the data if it was not supported. Yahoo Mail says that it supports import from Outlook but it doesn’t specify Outlook Express. I assume the format between Outlook and Outlook Express must be similar because Yahoo Mail did import the exported contacts from Outlook Express. Below I describe how to export Outlook Express contacts and then import those contacts into Yahoo Mail. Follow the instructions below that are broken into two parts which include exporting the contacts using Outlook Express and then importing the contacts using the Yahoo Mail web interface.