Outlook is different from Outlook Express.
In Office you'll get Outlook and not Outlook Express. So if you want to install Outlook, Just select Custom when you install Office and select only Outlook from the list and install. ...
Go to Add Remove Programs (appwiz.cpl) --> Select Office 2003 ---> Change/ Remove ---> Change ---> click the Drop Down against Outlook --> Select (Unavailable or option of that effect) and then follow the Wizard.
This should do the trick, I don't have Office 2003 on my machine to confirm but try that and let us know in case u face some issue.
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