Create Meeting Request in Outlook 2007 Generates Multiple Email Addresses

At one time I had an incorrect Email address for one of my clients
((E-Mail Removed) for example).
I Emailed several times to this incorrect address and they bounced as
undeliverable.
I have since corrected the Email address to (E-Mail Removed) (for
example).

When I click on the contact and then 'create new message', only his
correct Email address is displayed in the 'to' portion of the Email.

However, when I click on 'create a new meeting request', the 'to' is
displayed as 'Allan C ((E-Mail Removed)) <(E-Mail Removed)>'

All assistance is appreciated.