In order to display personal addresses in Webmail, you need to do the following:
Open the mailfile whilst holding down both ctrl+shift.
You should see a list of folders beginning with a dollar below any existing folders.
Select the $contacts view.
Open the personal address book and select and copy any names you want to be displayed in Webmail.
Go to the $contacts view and select paste. Now when you are in Webmail and select address these names should show in the Webmail adresses under the users name just like they are in notes mail.
Obviously these can only be updated manually.