Using Outlook XP IMO

When an email address for a contact changes or fails to work, I make the
necessary changes in the contact record, but still end up inadvertently
sending messages to the old address.

I discovered that this is because Outlook still 'remembers' the old address
and autocompletes it in error when I type the contact's name in the To field
of the message.  Although it is possible to spot this and manually change
the mistake, it requires a level of diligence and observation that rather
negates the purpose of the autocomplete feature and is wholly undesirable
behaviour that can cause many problems and is very frustrating.

This would explain why I get so many messages to my old email address from
other contacts who say they've updated my contact record.  It's very likely
that they are unaware of this problem.

Is there any fix or way to purge/delete these old unwanted email addresses
from Outlook?

Has the problem been addressed or is it being addressed in newer/future
releases of Outlook?