I like that they are getting rid of File menus, but they need to make sure the items in the menus are put in the interface like I see in IE7 and WMP 11. I like the idea of toolbars becoming menus because it makes more sense, just make sure its complete.

As for the many different email clients, it seems like they started working on WLMD too late to even be considered to replace Windows Mail. I imagine that they would have to delay Vista further to add it.