Installing Office 2007 Beta 2 over Office 2003
If you currently have Office 2003 (or any Office 2003 component such as Visio or Publisher) installed you’ll run into some problems if you upgrade to Office 2007 Beta 2*. The Office 2003 components will not be completely removed and you may have issues such as returning shortcuts or Outlook add-ins trying to reinstall eventually bringing Office 2007 to a grinding halt. If this happens, check out the “Windows Installer CleanUp Utility” for removing all vestiges of Office 2003. You may then have to perform a repair of the Office 2007 applications. See KB290301 for more information. Probably best to remove an earlier version of Office before installing Office 2007.
(* It’s probably mentioned in the release notes somewhere but why waste time reading release notes when you want to check out the new Outlook?)