Hi Lon,
Backup your Windows Address Book before doing anything (*.WAB)
Same file (.WAB) is used by both Outlook Express and by Outlook.
You will need one extra column of data in your Excel file, because the WAB
when using Import of a CSV file requires an ending comma.
Export from your WAB so that you can get the format of the column headings then
you can import them back in with your new data or maybe just import the new
data in the correct format -- but that's why the backup is important.
In your address book under File you will see import and export and you want
that to be Test File (csv - Comma Separated Values) so you can make changes.