Remove 'Non Commercial Use' in Office title bar

QUESTION: - How to easily & quickly remove the 'non commercial use' in the
title bar for a newly installed version of office professional 2007?

BACKGROUND
I am running Windows 7 and have the Office Professional 2007 on dvd.
My new laptop was pre-installed with office 2007. I did not un-install this,
I just put in my new office 2007 professional dvd and completed the
installation.
Everything works, however, outlook (only outlook) displays the
'non-commercial use' in the title bar. I have no entry for office 2007 in
the add/remove
programs. The only entry is for my new office professional 2007. So I
cannot now uninstall the 'trial version' that came with the laptop.

ANSWER ?
I could backup my pst file and uninstall office and clean out all registry
entries. Then re-install office professional 2007, put back my pst file and
add in my 10 different email accounts again. But honestly, this would be a
pain. So is there an easier way to do this or at least a way to backup the
settings of my outlook email accounts (export)?

Thanks
Patrick