I used the trial version of MSO 2007, I think the UI is very attactive and fancy, no doubt about that, but one thing I found is People can get confused about the UI, switch around between the menus, it is very hard to find the right option which people are used to in previous versions of MS, I don't a lot of people will upgrade to the 2007.
on the other hand, I really think the UI of OOo need to improved to make a huge success. Regards zhaosheng 2007-04-09