How do you revert from Outlook 2007 back to Outlook 2003?

After using the trial version of Office 2007 for a while, I have decided
against a permanent upgrade. Now I want to go back to Office 2003. The only
Office program I’m worried about when I do this is Outlook. I know there was
a pst file format change in Outlook 2003 that made it difficult to go back to
an earlier version, but I’m not sure if the file format changed again for
Outlook 2007. What is the recommended procedure for uninstalling OL 2007 and
getting OL 2003 running again?