[sirace1]

I believe what is happening here is that when you are composing the email and you begin to type the name of the recipient outlook
is pulling the email address from the default Global address list rather than the contact list and that is why the email changes
to what you mention in your email.

The Global address list is displayed by default when ever you click the TO or CC button in outlook. Also remember that the contact list can contain both an individual email as well as a distribution list.

Check the Global address list to see if you find this email address you mention in your email with the @aol.com address.

If none of the above is happening then my understanding of your issue is that Outlook is automatically changing the user email
address with an @aol.com that does not exist in none of your address books.

If that is the case, I would then visit the microsoft website knowledge base and check if some one has submitted a posting with a possible fix for your issue.

Good luck in your research..