I have a user martialn who has the menu bar(file, edit, tools..) missing from his outlook 2007.
I tried to reset it by using customize toolbar but nothing worked.
So, to fixed it, I renamed the file outcmd.dat to old_outcmd.dat and reboot the computer. It is not easy to find that file.
so,here is the exact location (make sure show hidden folder is enable)
C:\Documents and Settings\martialn\Local Settings\Application Data\Microsoft\Outlook\
Please replace the user martialn by your customer user name.