I need to change an alias for a user easily

I run Small Business Server 2003 with Exchange and I have a receptionist that
left and the replacement needed the old user's account for documents and
email. I renamed the account in all areas, but the alias remains the old
user name when sending a new email to the new user. Auto complete displays
the new user but with the old alias. For example: olduser
I need a way to change that. I have tried deleting the name from my
recipients list and getting it again from the global address list but it
still shows the wrong alias. What can I do?

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