If during the Outlook 2003 automated setup program you were prompted to enter the key and it was accepted without a problem, then after the setup completed, when launching Outlook 2003, you were prompted for it a second time and then told that it is not valid, it is highly likely that this is caused by having two separate versions of Office / Office Products installed at the same time. Below is a link to a Microsoft Support article that explains the situation more specifically:

http://support.microsoft.com/default.aspx?scid=kb;en-us;321346

Generally, it is advisable to uninstall any previous versions of Outlook before installing 2003. Please un-install Outlook 2002/2003 and re-install Outlook 2003 only.

Article ID: 156, Created: March 8, 2011 at 2:59 PM, Modified: March 8, 2011 at 5:26 PM

The Outlook 2003 product key provided by Alentus does not seem to be working. Can you please advise?

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