Well, when they tried to rebuild something, they ended up removing the start menu and a couple of other things that a third party started to provide for a fee and they had to backpedal many of these changes. I finally received the update on my corporate machine where they bring back the option to ungroup apps after a couple of years...
Microsoft is a little different as they never really rebuild. Outlook is basically the same as it was in 1995, including non-functional search. :)