Here is how I do it.   In outlook - choose File - import & export.
Click import from another program or file - hit next
Select Microsoft Access - hit next
under file to import - select browse and select the database that has the
email addresses in it - hit next
Select Contacts  - hit next
Select the table that has the email addresses in it and hit the button to
the right that says map custom fields .  Drag the fields on the left to the
place you want them to reside in outlook
Hit ok and then finish and you are done.