Honestly. Why is this question proving SO difficult for Microsoft to answer? After all the flack you received over Vista, why on Earth is the 'XP compatability mode' being restricted to Windows 7 Ultimate - which will NOT be the version installed on the PCs that the very people who care about this question will be buying i.e. the 80% of users who are ordinary people, not geeks?
I just want to know if I can use my Microsoft Office 2000 Professional on Windows 7. Office 2007 is a nightmare that ordinary people who have spent years learning earlier versions did not ask for. I just want to be given the dignity to continue using one of YOUR products that millions of us LOVE. Please???