Vista Premium and Outlook 2003 conflict

I have just bought a Vista PC. I have loaded Outlook 2003 (Microsoft Office XP) and got a message that “ordinal 9170 not found in Dynamic Link Library MSO.dll” I have trawled forums and others seem to have had problem but I have not seen an answer.
Also I have loaded Microsoft Office 2007 (trial version) and Outlook 2007 does not work either. I have seen something about re-saving the outlook.pst file in another location then uploading from there, but Vista does not even allow the program to finish booting before it tell me there is a problem and it will get back to me.
All ideas welcomed