Change name that is displayed on Outlook email

I have a user who wants her email address changed, and the display name, but not her domain logon.   I went into active directory and changed her last name, the display name and her email address.  The address now shows up correctly when she sends and email, and is correct in the corporate address book.  However, the display name that is show when she sends an email is still the old name.  How do I change this?  Outlook 2007, exchange 2003.  Thanks!
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Wait four hours and it'll be changed, it takes time to sync active directory and Exch Server

AmitIT ArchitectCommented:
Wait for 24 hours. It will be fixed automatically. Or use Replmon to force the replication and Update the RUS.

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