I appear to have similar problems as others who have attempted to load
Outlook 2007. After apparently successfully (???) loading Office 2007 beta,
I could not start Outlook. I uninstalled 2007, and re-installed 2003 Office
Pro. I received the error message "Cannot start Microsoft Office Outlook.
MAPI32.DLL is corrupt or the wrong version. This could have been caused by
installing other messaging software. Please reinstall Outlook."

I reinstalled outlook with the same results.
I renamed MAPI32.dll as MAPI32.old and ran fixmapi.exe. No luck

Can anyone supply any other suggestions? I am out of luck and I cannot
access my calendar or messages.