The author mentions that experienced users will miss customization. However, users can put frequently-used tools on the banner at the top of the window, with more buttons available than older versions of Office had.
I have been using Office 2007 for about three weeks on one machine, but I still have older versions on other machines, so I switch back and forth a lot. I have found that Office 2007 is generally more intuitive and user-friendly than the older versions. There is a transition curve, but in the long run, the new settings make much more sense, IMO.
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