Noncompliant, you wrote on Wed, 7 Mar 2007 22:50:32 -0600:

My son gave me his Outlook 2003, full version. I have an Outlook 2000
installed, upgrade version. Can I install over 2000, or do I need to
uninstall 2000 first?
Have backup pst file available for 2000. Can I restore all my email,
appointments, contacts in 2003 with that pst file?

Simply install Outlook 2003. The existing version will be replaced by
OL2003 during setup.

--
Best Regards
Christian Goeller
http://www.outlookfaq.net