[dba-Tech] Uninstalling Outlook 2003 for Outlook 2007

I didn't install Outlook 2007 because I didn't want to uninstall 2003. Now,
it looks like I'll have to because a publishers wanting 2007 content. 

If I uninstall 2003, am I going to lose everything? I have no idea how to go
about this. I'd like to install 2007 on a different system and keep them
both -- I may still go that route. 

Susan H.