I don't like the preview Rated 2 out of 5 stars
I've always used this toolbar. I like the convenient search box. However, I liked being able to click the mail button to go straight to my mail. Now I have a preview window. No bueno. Has to go.
For those of you reading this until this is changed, if your favorite button has a preview window, go to add/edit buttons, create a custom app and put the actual url there. There you go!